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# Chemistry watch

1. ...
2. (Original post by mansmachine)
I need help of this homework question as I have no clue how to go about it.
How many moles of sodium ions are contained in 1dm3 of 2M sodium sulphate solution?
A - 1 mol
B - 2 mol
C - 4 mol
D - 5 mol
All I have so far is that there are 2 moles of Sodium Sulphate.
Sodium sulphate is Na2SO4, so there for there are two Na+ ions so for every mole of sodium sulphate there are two moles of sodium ions therefore 2x2=4 .. answer is C
3. Hi, I would find the total mr of sodium sulfate, and put the mr of the sodium over the mr of sodium sulphate. This tells you the ratio of sodium to everything else in the compound. Then times the fraction by 2 to find the moles of sodium.

Hope this helps 😁

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