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2011ҩѧרҵϰժҪע

Դ 2011425
: עưע빤ǰĻע͡ע;ȷ빤յоעİȫԺ͸ѹĵڡ

ʮڡע

һע빤ǰĻ

ݣ

1.ԭҩķӽṹԷǷнᾧˮ칹ܽܽٶȡѧȶԡ

2.ֽķ

4.աֲɡ

ע͡ע;ȷ

һҩˮҺע

ԵƳɻ͡

˥ں̵ܶģƳɻƼҲƳɻעֻܼע

ע̼ԺܴƳɾעҲɿǼֹʹƳɼע

ҩܲȶƳҺͣƳע޾ĩ򶳸Ʒ

ҩͨעܴﵽҩʱƳҺͣƳ

빤յо

1.ܽȵIJⶨܽȷ

2.ȶԵĿȶ

20-3

ġעİȫԺ͸ѹĵ

1.עİȫ

ȫ԰ԡѪԡ̼ԡ̼ԡʹԲԭ

(1)ҩﱾд̼ԡ

(2)pH͸ѹ͸ѹͿѪ

2.͸ѹĵ

͸ѹ0.9%ˮ5%Һ0.9%ˮһȣŨΪ0.45%ȻҺΪ0.5ȡ͸ѹĵڷУ

(1)㽵ͷ

ѪҺҺıΪ-0.52棬Ϊ-0.52ҩҺΪѪҺʿñ㽵ͷҩҺĵ㹫ʽ

W=(0.52-a)/b

W:ÿ100mlҺ͸ѹڼ(g);aҩҺõı½(0C);b1%͸ѹڼı½(0C)

100ml2%³ҺҪȻƣʹɵҺ

⣺³ҺŨΪ2%ʱa=0.122=0.24

1%ȻƵı㽵b=0.58

ҪȻƵW=(0.52 - 0.24)/0.58=0.48

100mlҪ0.48gȻ,0.48%ʾ

(2)ȻƵ

ȻƵָ1gҩʵЧӦȻƵ

X=0.009V-EW

XΪVĵҺȻƵ(g)

VҩҺ(ml)

E1gҩȻƵ()

WΪVҩҺҩ

֪ͷƵȻƵΪ0.242% ͷҺ100 mlȻƣʹɵҺ

⣺V = 100ml;E=0.24;W=2%; EW=0.242=0.48

X = 0.009100C0.48 = 0.42g0.42gȻơ

(3)ҺҺ

ҺָҺ͸ѹѪ͸ѹȣһҺָϸĤȵҺڵҺУᷢѪ󡣵Ǹѧ

ҩҺĵŨŨȻЩҩҺȻѪţѪҩһȻƻǺɱѪ

3.עʹ

˵͸ѹ⣬ɼֹʹ磺״࿨0.5%嶡

עооֲֹʹ־˫õĸӼ

A.³

B.࿨

C.

D.״

E.

𰸣D

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