2011ҩѧרҵϰժҪע
Դ 2011425
: עưע빤ǰĻע͡ע;ȷ빤յоעİȫԺѹĵڡ
ʮڡע
һע빤ǰĻ
ݣ
1.ԭҩķӽṹԷǷнᾧˮ칹ܽܽٶȡѧȶԡ
2.ֽķ
4.աֲɡ
ע͡ע;ȷ
һҩˮҺע
ԵƳɻ͡
˥ں̵ܶģƳɻƼҲƳɻעֻܼע
ע̼ԺܴƳɾעҲɿǼֹʹƳɼע
ҩܲȶƳҺͣƳעĩƷ
ҩͨעܴﵽҩʱƳҺͣƳ
빤յо
1.ܽȵIJⶨܽȷ
2.ȶԵĿȶ
20-3
ġעİȫԺѹĵ
1.עİȫ
ȫԡѪԡ̼ԡ̼ԡʹԲԭ
(1)ҩﱾд̼ԡ
(2)pHѹѹͿѪ
2.ѹĵ
ѹ0.9%ˮ5%Һ0.9%ˮһȣŨΪ0.45%ȻҺΪ0.5ȡѹĵڷУ
(1)㽵ͷ
ѪҺҺıΪ-0.52棬Ϊ-0.52ҩҺΪѪҺʿñ㽵ͷҩҺĵ㹫ʽ
W=(0.52-a)/b
W:ÿ100mlҺѹڼ(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
ҺָҺѹѪѹȣһҺָϸĤȵҺڵҺУᷢѪǸѧ
ҩҺĵŨŨȻЩҩҺȻѪţѪҩһȻƻǺɱѪ
3.עʹ
˵ѹ⣬ɼֹʹ磺״0.5%嶡
עооֲֹʹ־˫õĸӼ
A.³
B.
C.
D.״
E.
𰸣D
Ƽ
ࣺdrfcy