# Metal ions always catalyse Hydrolysis. Why?

When we use metal ions in hydrolysis, why do reactions become fast?

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Welcome to Chemistry.SE. Could you provide a link to your claim that metal ions always catalyze hydrolysis? I'm pretty sure that some metal ions, (e.g. $\ce{Na+}$ do not do this. Also, it would be helpful if you specify which type of hydrolysis you mean (there are several hydrolysis reactions). Doing these two things will help guarantee a better answer for you. –  Ben Norris Dec 11 '12 at 18:00