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mol HCl= 0,8 x 2,5= 2 mmol
berarti 2 mmol HCl bisa menetralkan 1 mmol CaO
1 mmol CaO=massa CaO/Mr CaO
massa CaO= 0,056 gram
kemurnian = massa CaO yg bereaksi/masa awal x 100%
=5 %