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Mixing acid with water it will result in decrease in no. Of hydronium ion per unit volume . acid shd be added to water not water to acid because if we'll add water to acid a highly exothermic reaction takes place which may cause breakdown of apparatus nd acid may splash out nd may cause burns
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Because conc. acid is higly reactive and acidic and if we dont handle it proprely it may cause harm during exp.. thats why dilute acid is used.
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