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07 Question (12 points) e See page 816 1st attempt See Hint Part 1 (6 points) Calculate the solubility (in M) of cobalt(II) hydroxide, Co(OH)2(s) in H20. Ksp = 3.50x10-16 at a specifictemperature. See Hint Part 2 (6 points) What is the pH of this solution of cobalt(II) hydroxide? pH 04 Question |See page 792 (15 points) A buffer solution includes a weak acid and its conjugate base. 1st attempt See Hint Feedback Include states of matter. Write a balanced chemical equation for the equilibrium reaction occurring in a buffer containing NH3 and NH4CI. Write the equation so that its equilibrium constant is equivalent to Ka. х. Не (aql NH (ag) +H0(1) NH,(aq) +H2O(aq) 03 Question (9 points) e See page 789 Calculate the pH of a solution that is 0.195M benzoic acid and 0.210Msodium benzoate, a salt whose anion is the conjugate base of benzoic acid. 1st attempt See Hint Express the pH to at least two decimal places.

Answer 1

Paty Co t aulL dimocial as 01 20H ag olet, pdlubility ot Coloth iss'm CO2 2S M cfain ot pay prhact Now 3.Sa x1 3.5X10 '/ S - S -9.35×ハ-う Solubility of Co 9/x S.6 Past 2 CO = 2 S 2 x9.35 xI0 ニ187 XIる-8 poN--n Cot 87x10 8 7.73 + POH 14 PH14-P6H = J4-773 6.27 au beane oA NRAK aeid NHy cl NHyCl TKe bal aned chemi c al eamati On ka di bui ain an el rel ate d NH tH6 ) The eanubii um utawt NH, la) Ka TheN1

rem Hemdesaou Han el bal ch eamat we ger ptPka t whre, A Ad C.B Cnjugal bare of CA CATBn oie aid rc. B1Sodivm Bonge ate 0210 An 420 Pka of beng oie aid 0-216 Ph410 log 02 4.20 o03 2 423 PH= 423