A student was asked to determine the percentage of zinc metal in a mixture of zinc metal and zinc oxide. He reacted the mixture with...

      

A student was asked to determine the percentage of zinc metal in a mixture of zinc metal and zinc oxide. He reacted the mixture with excess hydrochloric acid and accurately collected the gas evolved, which was then used to calculate the amount of zinc in the mixture.
(a) Name the gas that was evolved
(b) Apart from the reaction liberating the gas write a balanced equation for the other reaction that took place.
(c) Why would dilute nitric acid not suitable for this reaction?

  

Answers


john
(a) Hydrogen gas

(b) ZnO(s) + H2SO4(aq)----->ZnSO4(aq) + H2O

(c) Nitric acid being a strong oxidising agent oxidizes hydrogen formed to water no gas is therefore evolved.
john3 answered the question on November 4, 2017 at 22:43


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