Question

calculate the amount of oxalic acid ( c2h4o2.2h2o) crystal to prepare 2m solution in enough water to make solution 250ml​.

I will mark brainliest who will answer to this for sure

Answer 1

Answer:

That answer is, unfortunately, wrong. Instead of telling you the answer, I will give you some key clues to getting it correct yourself.

Explanation:

First off, do not fall into the trap of confusing one mole of acid with one mole of hydrogen ions in solution. You need to work with the whole molecular formula of the acid just like you would do with any other compound. In other words, the reaction

H

2

C

2

O

4

∙

2

H

2

O

→

2

H

3

O

+

+

C

2

O

2

−

4

is not relevant, only the original formula

H

2

C

2

O

4

∙

2

H

2

O

is relevant to determining a one molar solution. Incidentally, a 1M solution of oxalic acid does not come anywhere near producing 2M (solvated) hydrogen ions. Oxalic acid in water is only a weak acid.

Second: Remember to include water of hydration in the formula, too, meaning the

2

H

2

O

part of the formula counts towards the mass of one mole, too. I need to be careful with that myself in the lab at work, or else I do not make up my pickling acid solutions (containing hydrochloric acid and iron chloride) correctly.

Good luck!