Calculate the mass of KCl required to make 250g of a 5% (w/w) KCl solution

&

Calculate the volume in mL of a 3M HCl solution that contains 0.430 mol HCl

Thanks.

Question

Calculate the mass of KCl required to make 250g of a 5% (w/w) KCl solution

&

Calculate the volume in mL of a 3M HCl solution that contains 0.430 mol HCl

Thanks.

anonymous · Answer

If someone could walk me through these that'd be great.

jfraser · Answer

For #1, the total mass of the solution should be 250g. 5% of that mass should be made up of KCl (solid). The remaining mass is the water that the salt gets dissolved into. Find 5% of 250g.