periodic table

The similarities of elements in the same groups and periods.

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.

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 calcula ...continues

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.

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

percent ionization

What is the percent ionization of the acid in a 0.0008M solution of nitrous acid (HNO2) (ka 4.0e-4)? (4 times 10 to the poer of -4).

Calculating the pH of a solution.

What is the new pH if a drop containing 0.001 moles of HCl is added to 100.00 ml of a solution 0.100M in each of acetic acid and sodium acetate? (ka for acetic acid 1.75e-5) 1.75x10^-5

pH of a solution

40.4mL of 0.100M nitric acid solution is added to a 1.00L volumetric flask and the solution is made up to the mark. What is the pH of the solution?

Calculating the volume of an acid required to change the pH of a buffer solution.

What volume (in mL) of 0.37M HCI solution must be added to 265.00 mL 0.29M ammonia solution to give a buffer solution with pH 9.1? (Kb for ammonia 1.80e-5) 1.80 x10^-5

pH of a solution

1.50g of sodium flouride is dissolved in water and the solution is made up to 250.00mL in a volumetric flask. What is the pH of the solution? (Ka for HF 1.0e-3) 1.0 x 10 to the power of-3.