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Dissolve 0.01 mole 1) methformin, C4H11N5 in some milllilitrers dilute HCl and when dissolved add up to 10 ml.

1) Be aware that methformin is only soluble as hydrochloric salt ( C4H11N5.HCl ).

So you should correct for the real molacular mass: 129.164 g/mol (C4H11N5) compared to 165.63 g/mol for C4H11N5.HCl if you are weighting the salt in stead of the pure methformin.

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