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I need help to find the concentration of quinine in the stem solution. i weighted 121,90 mg quinine sulphate and put it into a 100

I need help to find the concentration of quinine in the stem solution.

i weighted 121,90 mg quinine sulphate and put it into a 100 ml measuring flask. It was mixed with 3 ml 1M H2SO4. Then it was dissolved with water up to the mark on the flask.

molar mass of quinine sulphate: 782,95 g/mol.

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