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2016-05-11View Original

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If a normal salt-acid solution is left standing for an extended period of time at normal pressure and temperature, does its concentration increase or decrease? What is the principle behind this?

Reply #22016-05-11

The concentration of the salt acid solution decreases; one reason is evaporation, due to the vapor pressure, and the other is absorption of water vapor from the air.

Reply #32016-05-12

Water will evaporate more than HCl, so the concentration will increase, right?

Reply #42016-05-12

I really hadn’t thought of that. Experts, from a theoretical perspective, as water evaporates, the concentration increases

Reply #52016-05-16

Helping you out here @HSLJHZ @ylb913 @EvilReaped @WangTianze @WiseOne @jacques0920

Reply #62016-05-16

With concentrated salt, adding more acid makes it weaker; with diluted salt, adding more acid makes it stronger.

Reply #72016-05-17

Can it be explained theoretically?

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