Calculate the pH at 25 °C of a 0.30M solution of sodium benzoate (NaC,H,CO,). Note that benzoic acid (HC, H, CO,) is a weak acid with a pK, of 4.20. Round your answer to 1 decimal place.

A solution is prepared at 25 °C that is initially 0.16 M in benzoic acid (HC,H,CO,), a weak acid with K,=6.3 × 10 °, and 0.058 M in sodium benzoate -5 %3D (NaC H,CO,). Calculate the pH of the solution. Round your answer to 2 decimal places.

The Kb for four bases are CN'- = 1.6 x 10-s, CO;²- = 2.1 x 104, NH3 = 1.8 x 10“, F'- = 1.5 × 10-11. If the pH's of 0.50 mol/L solutions of each of these weak bases were measured and they were placed in order from highest pH to lowest the result would be which of the following? a. CN', CO3", NH3, F'- b. CO;?,NH:, CN', F'- c. F', CN',NH3,CO;?- d. CO?²,CN',NH3, F'- е. none of the above

3. Lactic acid, C,H;O; (90), is a weak acid that gives yogurtits sour taste. Calculate the pH of a 0.0010 mol/L solution of lactic acid. The K, for lactic acid is 1.4 x 104 16 INQ

A solution is prepared at 25 °C that is initially 0.15M in propanoic acid (HC₂H-CO₂), a weak acid with K=1.3 × 105, and 0.18M in potassium propanoate (KC₂H,CO₂). Calculate the pH of the solution. Round your answer to 2 decimal places. pH = 0 X S

For each of the following entities • Identify it as a strong or weak acid. • Select the correct arrow to show the changes that occur when the acids are placed in water. • Select the approximate pH for each resulting solution. HCI(aq) is classified as a + acid. The reaction equation with water utilizes which of the following arrows? Choice A Choice B 7 >>7 H2SO3(aq) is classified as a The reaction equation with water would utilize which of the following arrows? Choice A Choice B < 50% H2SO3(aq) + H20(I) • HSO3 (aq) + H30*(aq) The approximate pH of the solution would be

Calculate the pH at 25 °C of a 0.51M solution of sodium benzoate (NaC,H,CO,). Note that benzoic acid (HC,H,CO,) is a weak acid with a p K, of 4.20. Round your answer to 1 decimal place. pH =||

A solution is prepared at 25 °c that is initially 0.32M in propanoic acid (HC,H,CO,), a weak acid with K,=1.3 × 10, and 0.23 M in potassium propanoate (KC,H,CO,). Calculate the pH of the solution. Round your answer tO 2 decimal places. pH

A solution is prepared at 25 °C that is initially 0.27M in chlorous acid (HCI0,), 2 a weak acid with K,=1.1 × 10 and 0.29M in potassium chlorite (KCIO,). Calculate the pH of the solution. Round your answer to 2 decimal places. pH = U ? olo Ar

Suppose you want to prepare a solution with a pH of 4.00 using acetic acid, CH3COOH, and sodium acetate, CH3CoOONa. What should the ratio of sodium acetate to acetic acid, CH3CO0-| : [CH3COOH], be in your buffer solution? Hint: The Ka for acetic acid is 1.8x105. 0.18:1 O 1.9:1 0.84:1 O 5.5:1 O 1:1