Tính nồng độ mol/l của dd H2SO4 và dd NaOH biết rằng : 1. 30ml dd H2SO4 được trung hòa hết bởi 200 ml dd NaOH và 10 ml dd KOH 2M 2. 30ml dd NaOH được trung hòa hết bởi 20 ml dd H2SO4 và 5 ml dd HCl 1M

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