A 10.0-mL sample of 0.75 M CH3CH2COOH is titrated with 0.30 M NaOH. What is the pH of the solution after 22.0 mL of NaOH have been added to the acid? Ka = 1.3 x 10–5

The indicator propyl red has Ka = 3.3 x 10–6. What would be the approximate pH range over which it would change color?

Calculate Ksp for PbI2 at 25°C based on the following data:Species                       ∆G0f, kJ/mol Pb2+ (aq)                        -24.4I- (aq)                              -51.6PbI2  (s)                           -173.6

A lab technician adds 0.015 mol of KOH to 1.00 L of 0.0010 M Ca(NO3)2. Ksp = 6.5 x 10–6 for Ca(OH)2. Which of the following statements is correct?

Consider the reaction: N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = -249 kJ and ΔS° = -278 J/K at 25°C Calculate ΔG° and state whether the equilibrium composition should favor reactants or products at standard conditions.

The indicator propyl red has Ka = 3.3 x 10–6. What would be the approximate pH range over which it would change color?

Which of the following substances has the greatest solubility in water?

The following pictures represent solutions of CuS, which may also contain ions other than Cu2+ and S2- which are not shown. Gray spheres represent Cu2+ ions and dotted spheres represent S2- ions.If solution (1) is a saturated solution of CuS, which of solutions (2)-(4) are unsaturated?

In which of the following solutions would solid PbCl2 be expected to be the least soluble at 25°C?

A saturated solution of calcium hydroxide, Ca(OH)2, is in contact with excess solid Ca(OH)2. Which of the following statements correctly describes what will happen when aqueous HCl (a strong acid) is added to this mixture, and system returns to equilibrium? For Ca(OH)2, Ksp = 6.5 x 10-6