Question

10. A 25.0-mL sample of 0.150M hypochlorous acid is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base is added? The Ka of hypochlorous acid is 3.0 x 10-8 A) 7.25 B) 1.34 C) 4.43 D) 7.58 E) 7.46 11. Calculate the pH and pOH of a solution that is 0.075 M HCN and 0.06 M NaCN. 12. The solubility of silver bromide is greater in 0.10 M NaBr than in pure water. True or false? 13. What is the molar solubility of nickel hydroxide, Ni(OH)2? Ksp 6.5 x 1018 14. If a molar solubility of CaF2 at 35°C is 1.24x103 mol/L, what is Ksp at this temperature?

help with all these please

Answer 1

(10) Millimeter of Hoce = Millimeles of NaoH = = 0.15m x 25 mL = 3.75mm 0.15 MX 13.3 mL 1.995 mmel + - Hoce I 3.75 - 1.995 1.755 NaOH 1.995 -1.995 o oce + H₂O 0 +1.995. 1.995 c E PH = Pka + log [oce ] [roce] Pka = -log ka = -log(3x108) = 7.52 Total volume = 25 mL + 13.3mL = 38.3mL. [Hoce] = 1.755 M [oce] = 1.995 m. 38.3. 38.3 PH 7.52 + log (1.995 = 7.52 + 0.06 IPH = 7.58 | option (D)