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OCR chemistry...please help

Okay, I am trying my best to achieve an A or A* grade in ocr chemistry gcse, and I think I can do it, if I learn how to do the hard equations in C5. A question I just attempted (and epically failed at..) was this one:

KOH + HNO₃ -> KNO₃ + H₂O

The concentration of potassiumhydroxide solution is 0.100mol/dm³

Calculate thenumber of moles in 25.0com³ of potassium hydroxide solution

Reply 1

ChemicalBond

Hey!

First of all, you must convert the cm³ used in the volume into dm³, which you do by dividing it by 1000.

So the volume is 25.00/1000 = 0.025 dm³.

Then, to get the number of moles of solution, multiply the volume (dm³) by the concentration.

0.025 * 0.1 = 0.0025 mol

:smile: