4. 45 ml of 0.5180 M HCl was added to a mixture of SrCO3 and Li2CO3 salts weighing 0.5191 g. The excess acid was titrated with 19.43 ml of NaOH [T(NaOH/HCl)=0.01938 g/ml] using methyl orange to calculate the mass fraction (%) of SrCO3.

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