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# pH of the solution

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2. if log(x) = -0.123, what does x equal?

Using Dissociation Constants
Proteins are complex biological molecules made of smaller molecules called amino acids. Five common amino acids and their Ka values are listed below. Rank them from strongest to weakest acid.

Acid and Base Formulas
What is the chemical formula for the base iron(III) hydroxide?

Part B
The formula for the oxalate ion is C2O4^2- . Predict the formula for oxalic acid.

The pH Scale
What is the pH of an aqueous solution with [H3O+] = 2 * 10^-14 M?
Express the pH numerically using three significant figures.

Part B
Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid.
What is the molar concentration of H3O+ in a cola that has a pH of 3.120?
Express the molar concentration numerically using three significant figures.

Ionization of Water
9.00×10^-3 mol of HBr are dissolved in water to make 11.0 L of solution. What is the concentration of hydroxide ions in this solution? Express your answer numerically in molarity.

Part B
6.00 g of NaOH are dissolved in water to make 3.00 L of solution. What is the concentration of hydronium ions in this solution?

Problem 10.35
Calculate the [OH-] of each aqueous solution with the following [H3O+] .

coffee, 1.0×10^-5 M
part B: soap, 1.0 x 10^-8 M
part C: cleanser, 5.0 * 10^-10 M
part D: lemon juice, 2.5 * 10^-2 M