i have a chemistry problem i need help?

Question

i need to calculate the mass of potassium hydrogen phthalate which must be dissolved in water to make 500ml of 0.2000M solution. plz help

Answer 1

This is a very simple problem; first calculate the number of moles of KHP required for the solution; then multiply by molecular weight of KHP:

0.2000mol/l x 0.500l = 0.100moles KHP

KHP is C8O4H5K:

[(12.01 x 8) + (16.00 x 4) + (1.01 x 5) + 39.09] = 204.22g/mol

204.22g/mol x 0.100mole = 20.42g KHP

Answer 2

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