Which of the following has the highest pH? O pure water O 0.1 M HA, pK, = 11.89 O 0.1 M HD, pK, = 8.23 O 0.1 M HC, pK, = 4.55 O 0.1 M HB, pK = 2.43 %3D

Formic acid, from the Latin formica, is the acid present in ants sting. What is the concentration of HCOO- at equilibrium if the initial concentration of formic acid, HCOOH, is 2.75 M (Ka = 1.7 x 10-4). What is the hydronium concentration at equilibrium of a weak acid whose concentration is 4.05 M and Ka is 2.0 x 10-4? A 1.80 M solution of an unknown acid has a pH of 1.22. What is the Ka?

ASK YOUR TEAC The hydronium ion concentration in a sample of springwater is found to be 6.3x10 M at 15°C. What is the concentration (in M) of hydroxide ions in the springwater? (K = 4.57x 10¬15 at this temperature.) 40 t. Supporting Materials EPeriodic Table Constants and Supplemental Data Factors Additional Materials Section 14.2 MacBook Air 吕0 888 DII DD F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 %23 $ & 1 2 4 7 8. Q W E Y { A G K C V B N T F. R D. #3 Σ

Each solution below has pH = 4.5. Which solution most effectively maintains pH between 4.0 and 5.0 upon addition of a small amount of strong acid or base? O 1.00 M NaF +0.050 M HF. K₂(HF) = 6.3 x 10-4 O 2.1 M NaH₂PO4 + 0.0085 M H3PO4. Ka1(H3PO4) = 7.5 × 10-³ 0.80 M NaNO₂ + 0.055 M HNO₂. Ka(HNO2, nitrous acid) = 4.6 x 10-4 O 1.0 M NaC7H502 +0.50 M HC7H5O2. Ka(HC₂H5O₂, benzoic acid) = 6.3 × 10-5

23.

Calculate the concentration of hydroxide in the following solutions. Pure water (pH = 7.00) 3 M KOH 3 M NH3 (Kb = 1.8 x 10-5)

For H2CO3, Ka1 = 4.3 × 10–7, Ka2 = 4.7 × 10–11. What is the pH of a 0.36 M solution of carbonic acid?

For the diprotic weak acid H₂A, Kal = 2.8 x 10-6 M and K₁2 = 8.9 x 109 M. What is the pH of a 0.0450 M solution of H₂A? pH = What are the equilibrium concentrations of H₂A and A²- in this solution? [H₂A] = [A²] = M M