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Solution: Indicate the concentration of each ion or molecule present i...

Question

Indicate the concentration of each ion or molecule present in the following solutions: (b) 1.3 x 10–2 MgSO4

Assume that the volumes are additive.

Video Transcript

Hey guys, so here we have to figure out the concentration of each ion within the given concentration of a compound. So we have 1.3 times 10 to the -2 molar of magnesium sulphate, so we need to figure out the concentration of magnesium ion and sulphate ion. So this needs 1.3 times 10 to -2 moles of magnesium sulphate over 1 litre. Now we're going to say here for every 1 mole of the entire compound, I have exactly 1 mole of magnesium ion because there's just 1 MG in the formula.

So this gives me 1.3 times 10 to the -2 divided by 1 litre so that's 1.3 times 10 to the -3 molar of magnesium ion. Now we do the same thing with the sulphate ion so we have 1.3 times 10 to the -2 moles of the entire compound over 1 litre and remember for every 1 mole of the entire compound, how many sulphates do we see? Well we see exactly 1 mole of sulphate ion. So this would also give us the same exact concentration that we found earlier. So this would represent the concentration of both ions with a magnesium sulphate.