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The mark scheme says the calculations - but the trouble is, I don't know WHY they are using those calculations! More specifically, question (d) is what i'm struggling with. I get part (i) and the simple Concentration = No. Mol/Volume, but for the next three parts I have no clue!

The mark scheme says the calculations - but the trouble is, I don't know WHY they are using those calculations! More specifically, question (d) is what i'm struggling with. I get part (i) and the simple Concentration = No. Mol/Volume, but for the next three parts I have no clue!

All!

Will someone explain Q.8 for the Chemistry 2C paper - I really don't get it...