we're doing titrations in chemistry and im a bit confused on this one thing...
strong acid + weak base = what pH value?
and vice versa ie.
weak acid + strong base = what pH value?
i get that strong acid + strong base = pH 7 because they neutralise each other out but those first 2 just confuse me :/
thanks!|||The combination will take the nature of the strong component:
Strong acid / weak base = result acidic below pH 7.0
Strong base / weak acid = result basic, pH above 7.0|||a strong acid/base is a specie that dissociates completely in aq solution to give H+/OH- ions. A weak acid/base is a specie that dissociates into less no of H+/OH- ions.
Thus, weak base is incapable of replacing all h+ of acid so the ph is less than 7.
Same way reaction of strong base with weak acid gives ph more than 7.|||If you dissolve a strong acid, it will dissociate completely into H+ and the acid counter-ion. HCl, for example, forms H+ and Cl-. Because HCl is a strong acid, Cl- will not pick up protons, so it is not basic, and it can no longer donate protons, so it is not acidic, i.e. it is neutral.
CH3COOH (acetic acid) is a weak acid. It is not likely to donate a proton, in other words, the acetate ion (CH3COO-) is more likely to pick up a proton to form the stable acid. Since acetate picks up a proton, it is basic. Therefore, when you titrate a weak acid with a strong base, the end point is at a basic pH (i.e. higher than 7).
With a weak base and strong acid, it's the other way around. Weak bases are unlikely to accept protons, so their conjugate acids are more likely to donate protons instead. Therefore, when titrating a weak base with a strong acid, the end point will be at an acidic pH (less than 7).
Hope that makes sense.|||What you require is the proper indicator that will change colour at or about the proper pH.
Here are some . Any strong acid and any strong base use
Bromthymol blue = pH 7 Phenolphthalein = pH 9 Methyl orange = pH 4 Methyl red pH = 5
Have fun, especially at figuring out colour at the equivalence point.|||It'd probably be fair to assume that the weak base (Alkaline) will dilute the strong acid so:
Strong acid + weak base = Weak acid
%26amp;
Weak acid + Strong base = Weak base
Saturday, December 17, 2011
What the value of x when log base x of 1/10000 is equal to -4?
Log x 1/10000 = -4
I know x^-4 is 1/10000|||x^4 = 10000 = 10^4
=%26gt; x = 10|||log(1/10000) = - 4
or, - log(10000) = - 4
or, log10^4 = 4
or, 4log10 = 4
or, log10 = 1
or, x^1 = 10
therefore x = 10
(please put base as x for all the above expressions of log)|||Solve: log (x) (1/10000) = -4
log (x) (10000) = 4
Now, x^4 = 10000 = 10^4
=%26gt; x=10 ....................(Ans)|||x^-4=(10000)^-1
x^(-4)*(-1/4)=10000^(-1)*(-1/4)
x=10000^(1/4)
x=10 or x=-10
",
I know x^-4 is 1/10000|||x^4 = 10000 = 10^4
=%26gt; x = 10|||log(1/10000) = - 4
or, - log(10000) = - 4
or, log10^4 = 4
or, 4log10 = 4
or, log10 = 1
or, x^1 = 10
therefore x = 10
(please put base as x for all the above expressions of log)|||Solve: log (x) (1/10000) = -4
log (x) (10000) = 4
Now, x^4 = 10000 = 10^4
=%26gt; x=10 ....................(Ans)|||x^-4=(10000)^-1
x^(-4)*(-1/4)=10000^(-1)*(-1/4)
x=10000^(1/4)
x=10 or x=-10
",
How to I make excel change a specific cell value based on other values?
Basically I have an attendance sheet on an excel spreadsheet, I want it to insert a value in the correct cell based on the date, the name on the attendance sheet and I want it to insert a 1 or a 2 depending on if they have paid or not.|||Assuming column A: Date, column B: Name, Column C: Paid. You will put in "yes" or "no" on the Paid column. Put in a formula on column D: "=if(C2="yes", 1, 2)".
What is the value of Log (base 4) 1/8?
What is the value of each:
a) 10 ^ -10log3
b) 2log (base 3) 9
c) log (base 3) 3 ^2x|||.. log4(1/8)
= - log4(8)
= - log4( 4^(3/2) )
= - (3/2) log4(4)
= - (3/2)|||log(base 4) 1/8 = log(1/8) / log(4) = [log(1)-log(8)] / log(4)
= -log(8) /log(4)
= -log(2^3) /log(2^2)
= -3 log(2) / 2 log(2)
= -3/2
= -1.5
--------------------------------------鈥?br>
a)
10^[-10log(3)] = 10^[log(3^-10)] = 1/3^10
=
--------------------
b)
2 log(base 3) 0 = 2 log(base 3) (3^2) = 2(2) log(base 3) 3 = 4 (1) = 4
--------------------------------------鈥?br>
c)
log(base 3) 3^2x
= 2x log(base 3) 3
= 2x(1)
= 2x
a) 10 ^ -10log3
b) 2log (base 3) 9
c) log (base 3) 3 ^2x|||.. log4(1/8)
= - log4(8)
= - log4( 4^(3/2) )
= - (3/2) log4(4)
= - (3/2)|||log(base 4) 1/8 = log(1/8) / log(4) = [log(1)-log(8)] / log(4)
= -log(8) /log(4)
= -log(2^3) /log(2^2)
= -3 log(2) / 2 log(2)
= -3/2
= -1.5
--------------------------------------鈥?br>
a)
10^[-10log(3)] = 10^[log(3^-10)] = 1/3^10
=
--------------------
b)
2 log(base 3) 0 = 2 log(base 3) (3^2) = 2(2) log(base 3) 3 = 4 (1) = 4
--------------------------------------鈥?br>
c)
log(base 3) 3^2x
= 2x log(base 3) 3
= 2x(1)
= 2x
What do we base our currency's value from now?
Didn't we stop using gold?|||we stopped using gold in the 1950's.
Value of currency is based on people's beliefs about how much they can buy with that currency in the future.|||yes. our currency, and that of most modern economies around the world, is based on the willingness of the government to tax the citizens in the amount required to support the government's obligations in that currency. In other words, a government can require all commerce undertaken in its domain to accept its own currency as good for any debts or obligations, but unless trading partners and investors believe the government will tax its citizens for the value of the obligations from the citizens to the government, then the value of the currency would not support trade with other currency systems.|||Nixon took us off the Gold Standard in the earlier 1970s. Since then, our money has only been worth what you believe its worth. Its not backed by anything but thin air.
Value of currency is based on people's beliefs about how much they can buy with that currency in the future.|||yes. our currency, and that of most modern economies around the world, is based on the willingness of the government to tax the citizens in the amount required to support the government's obligations in that currency. In other words, a government can require all commerce undertaken in its domain to accept its own currency as good for any debts or obligations, but unless trading partners and investors believe the government will tax its citizens for the value of the obligations from the citizens to the government, then the value of the currency would not support trade with other currency systems.|||Nixon took us off the Gold Standard in the earlier 1970s. Since then, our money has only been worth what you believe its worth. Its not backed by anything but thin air.
MATH HELP! This is the exponent to which a specified base is rasied to obtain a given value.?
This is the exponent to which a specified base is rasied to obtain a given value.
a logarithm
b common logarithm
c logarithmic function
d relation|||a. logarithm
a logarithm
b common logarithm
c logarithmic function
d relation|||a. logarithm
Is property tax based off of the market value or the purchase price of the house?
I live in Florida and my boyfriend and I want to buy a house in Lee county but we are confused about the property taxes. We know that it can only go up no more than 3% from the previous year but my question is; 3% of what? Is it 3% of the amount that we purchased the home for or is it 3% of the value based on what the property appraiser declares the home is worth? Please help us to understand the details of this situation. Thank you!|||There are three approaches to value stipulated in the Florida Statutes: 1.) "Direct Sales Comparison", 2.) "Replacement Cost", and 3.) "Capitalization of Income". In Lee County, we use a computer assisted mass appraisal system that incorporates elements of all three approaches to value. Please keep in mind, however, that the best evidence of the fair market value is when several properties similar to yours sell.
The property鈥檚 fair market value can be determined employing one or more of three different methods.
The first method is to find properties like yours which have recently sold. However, their selling prices must be analyzed very carefully to get the true picture. One property may have sold for more than it was really worth because the buyer was in a hurry to occupy it and would pay any price to get in. Another may have sold for less than it was really worth because the owner needed cash right away, so was willing to sell to the first buyer making an offer. The Property Appraiser must always consider such over or under sales price to arrive at a fair valuation of your property.
The second method is based on how much money it would take, at current material and labor costs, to replace your property with one just like it. If any improvements are not new, the amount of depreciation must also be determined.
The final method is used in addition to the other two if you own property which does, or could, provide an income, such as an apartment complex, retail store space, or office building. In that case, the Property Appraiser must consider such dollar facts as your revenues, operating expenses, insurance, maintenance costs, degree of financial risk incurred by owning the property, and finally, the return most people would expect to receive on that kind of|||First, this is a general answer, so talk to the tax clerk in the county for exact and specific information.
Most jurisdictions base the tax on a formal assessment performed by the county/state/town tax assessor. This is NOT the sales price nor the market value as appraised by a real estate agent. Assessors tend to have a formal methodology for determining the assessment - based on recent comparable sales, square footage, etc.
Most jurisdictions re-assess all properties every 2 or 3 years (this is where the 3% comes in) - if the assessment goes up, the tax charged goes up (in your case, the tax could go up even if the assessment goes down due to the limits placed on prior years' increases).|||It is based on the amount the city determines your home and property is worth.
The city employed a person who will come out and appraise the property.. they do not even go inside the home.. they just look at the map of your home.. the amount of land you have and give an estimated appraisal value.. The 3% is based off of the amount the city appraiser says your home is worth.
- We live in a new home and our taxes were not appraised until a year after we moved in .. we had an appraisal by the bank that said our home appraised for $189,000 (he walked both inside and outside our home) that was for the loan from the bank.. then a year later a city appraiser came out and appraised the property for $179,000 (he just had a plot plan and a layout of our home on file.. he never spoke to us or entered our home) and our property taxes were determined by the amount the city appraised the home at - $179,000
The property鈥檚 fair market value can be determined employing one or more of three different methods.
The first method is to find properties like yours which have recently sold. However, their selling prices must be analyzed very carefully to get the true picture. One property may have sold for more than it was really worth because the buyer was in a hurry to occupy it and would pay any price to get in. Another may have sold for less than it was really worth because the owner needed cash right away, so was willing to sell to the first buyer making an offer. The Property Appraiser must always consider such over or under sales price to arrive at a fair valuation of your property.
The second method is based on how much money it would take, at current material and labor costs, to replace your property with one just like it. If any improvements are not new, the amount of depreciation must also be determined.
The final method is used in addition to the other two if you own property which does, or could, provide an income, such as an apartment complex, retail store space, or office building. In that case, the Property Appraiser must consider such dollar facts as your revenues, operating expenses, insurance, maintenance costs, degree of financial risk incurred by owning the property, and finally, the return most people would expect to receive on that kind of|||First, this is a general answer, so talk to the tax clerk in the county for exact and specific information.
Most jurisdictions base the tax on a formal assessment performed by the county/state/town tax assessor. This is NOT the sales price nor the market value as appraised by a real estate agent. Assessors tend to have a formal methodology for determining the assessment - based on recent comparable sales, square footage, etc.
Most jurisdictions re-assess all properties every 2 or 3 years (this is where the 3% comes in) - if the assessment goes up, the tax charged goes up (in your case, the tax could go up even if the assessment goes down due to the limits placed on prior years' increases).|||It is based on the amount the city determines your home and property is worth.
The city employed a person who will come out and appraise the property.. they do not even go inside the home.. they just look at the map of your home.. the amount of land you have and give an estimated appraisal value.. The 3% is based off of the amount the city appraiser says your home is worth.
- We live in a new home and our taxes were not appraised until a year after we moved in .. we had an appraisal by the bank that said our home appraised for $189,000 (he walked both inside and outside our home) that was for the loan from the bank.. then a year later a city appraiser came out and appraised the property for $179,000 (he just had a plot plan and a layout of our home on file.. he never spoke to us or entered our home) and our property taxes were determined by the amount the city appraised the home at - $179,000
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