2011ִҵҩʦҩѧרҵϰժҪڰ(8)
ʮڡע
һע빤ǰĻ
Ý£
1.ÔҩķӽṹԷǷнᾧˮ칹ܽܽٶȡѧȶԡ
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԰ԡѪԡ̼ԡ̼ԡʹԲÔ
(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)
VÒ©Òº(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)ÒºÒº
ҺָҺ͸ѹѪ͸ѹȣһҺָϸĤȵҺڵҺУᷢѪ󡣵Ǹѧ
ҩҺĵŨŨȻЩҩҺȻѪţѪҩһȻƻǺɱѪ
3.עʹ
˵͸ѹ⣬ɼֹʹ磺״࿨0.5%嶡
עооֲֹʹ־˫õĸӼ
A.³
B.࿨
C.
D.×´
E.
𰸣D
Ƽ
2011ִҵҩʦҩѧרҵϰժҪڰ(7)
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