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periodic table

The similarities of elements in the same groups and periods.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

4249

OTA ID:

103139

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Acids/bases : fraction present in acidic form

Hi. Here's the problem: "What fraction of an acetic acid/sodium acetate buffer (pka of acetic acid = 4.76) is present in the acidic form at pH = 5.20?" The answer is worked out in the book, but I don't know how to do the first step. Please see attached.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

4278

OTA ID:

101398

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Absolute entropy

Delta G sub f for Al203 = -1582 kJ/mol delta H sub f for Al203 = -1676 kJ/mol Calculate absolue entropy for S for oxygen (g) if: S for Al(s) = 164 J/mol K S for Al2O3 (s) = 51.0 J/mol K Calculate the heat required to raise the temperature of 35.0 g of aluminum from 800 degrees C to 2600 degrees C 1. To calculate the standard heat of formation of C2H5OH Steps are a) First write the reaction for the heat of formation of C2H5OH b)Calculate delta S for the reaction c)calculate delta G for the reaction d) Use the equation relating delta G, delta H and delta S to calculate delta H sub f of C2H5OH

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

4308

OTA ID:

103241

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find the pH of a solution

What is the pH of a 0.0001M solution of formic acid? (HCO2H) (ka 1.77e -4) 1.77x10 to the power of negative 4) the '2'is meant to mean 2 oxygen not 2 hydrogen, cannot make the 2 a smaller subscript.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

4313

OTA ID:

103060

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find the pH of a solution

50ml 0.200M acetic acid solution is added to 50.00ml .200M sodium hydroxide solution. What is the pH of the solution? (ka for acetic acid 1.75e-5) 1.75 times 10 to the power of negative 5

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

4314

OTA ID:

103211

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