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稀氨水中存在下列平：NH 3 ＋H 2 O NH 3 ·H 2 O NH 4 + ＋OH － 已知，25℃时溶液中存在下列关系： K ＝ ＝1.8×10 -5 （1）氨水中通入氨气时，平向 移动（用“右”、“左”填空，下同），氨水中加入氢氧化钠时，平向 移动。 （2）若向氨水中加入稀硫酸，使其恰好完全中和，所得溶液pH 7（填“＞”、“＜”或“＝”），用离子方程式表示其原因： ；若向氨水中加入少量(NH 4 ) 2 SO 4 固体，此时溶液中 （填“增大”、“减小”或“不变”）。 （3）25℃时，若氨水的起始浓度为0.5 mol/L，平时溶液中 c (OH － )＝__________________，pH＝______；向氨水中加入稀硫酸至溶液的pH＝7时， c (NH 4 + )＝ a mol·L －1 ，假定HSO 4 — 完全电离，则溶液中 c (SO 4 2— )＝ 。
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举一反三
【单选题】According to the theory of liquidity preference, if the demand for real money balances exceeds the supply of real money balances, individuals will:
A.
sell interest-earning assets in order to obtain non-interest-bearing money.
B.
purchase interest-earning assets in order to reduce holdings of non-interest-bearing money.
C.
purchase fewer goods and services.
D.
be content with their portfolios.
【单选题】The demand for real money balances is generally assumed to:
A.
be exogenous.
B.
be constant.
C.
increase as real income increases.
D.
decrease as real income increases.
【简答题】Section A (91) In the last few years the conventional wisdom has been that the advent of the new media will hasten the demise of print, and that the culture of print will soon be a thing of the past. ...
【单选题】When a feature remains in its existing charted position but has a change of characteristic,_____ command is used on a chart.
A.
DELETE
B.
AMEND
C.
SUBSTITUTE
D.
MOVE
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