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58问答库 > 有pH=12的NaoH溶液100ml，要使它的pH降为11..!（1）若加入蒸馏水，应加多少ml

有pH=12的NaoH溶液100ml，要使它的pH降为11..!（1）若加入蒸馏水，应加多少ml

2025-04-07 10:29:45

推荐回答（2个）

回答（1）：

1）若加入蒸馏水，应加多少900ml(2) 若加入pH为10的NaoH溶液应加 100 ml(3) 若加入0.01mol/L的盐酸，根据氢氧根的消耗设加V升盐酸，则有（0.01×0.1L－0.01V）/（V+0.1L）＝0.001 0.09＝0.011V V≈0.12L ≈120mL所以应加120mL0.01mol/L的盐酸

回答（2）：

A.PH=11.则c(NaOH)=0.001mol/L.为原来的1/10.加水的话溶液的体积应该变为原来体积的10倍.所以加水是900ml.
B.设加入PH=10的NaOH为VL
V＊10＾-4+0.1＊10＾-2=(V+0.1)＊10＾-3
解得V=1
所以应该加入PH=10的NaOH1000ml
C.设加入HCl VL
0.1＊10＾-2-V＊0.01=(V+0.1)＊10＾-3
解得V=0.0818L
所以应该加入0.01mol/L的HCl81.8ml

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