acidbase titration solution key saudi aramco:酸碱滴定溶液的关键沙特石油公司.pdf

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College Preparatory Program 鈥 Saudi Aramco Acid-Base Titration Solution

Acid-Base Titration Solution Key + - -4 CH NH (aq) + H O(l) 飪汣H NH (aq) + OH (aq) K = 4.38 x 10 3 2 2 3 3 b

In aqueous solution of methylamine at 25飩癈, the hydroxide ion concentration is 1.50 x 10-3

M. In answering the following, assume that temperature is constant and that volumes are

additive.

(a) Write the equilibrium constant expression for the reaction above. + 鈭 饊€娥€€ 肀侌€€ [肀傪€€ ] 3 3 戆 = 肀 [饊€娥€€ 肀侌€€ ] 3 2

(b) Determine the initial concentration of methylamine. Since the solution is a weak base, construct an ICE table + 鈭 [饊仾饊伅 肀叼€伅 ] 饊仾饊伅 肀叼€伅 [肀娥€伅 ] 砜 砜 砜 砜 Initial [饊€娥€€ 肀侌€€ ] 0 0 3 2 饊仏 Change 鈭掜饱 +肀 +肀 Equilibrium [饊€娥€€ 肀侌€€ ] 鈭 肀 肀 肀 3 2 饊仏 Substitute the expression of the equilibrium concentrations fo

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