A student adds excess zinc to warm dilute sulfuric acid. When the reaction stops the mixture is separated using the apparatus in Fig. 2.1. Fig. 2.1 (a) Name...
Question 1 Report
A student adds excess zinc to warm dilute sulfuric acid. When the reaction stops the mixture is separated using the apparatus in Fig. 2.1.
Fig. 2.1
(a) Name the piece of apparatus labelled A. [1]
(b) Name the item labelled B. [1]
(c) State the correct chemical term for the solid left behind and for the liquid collected as C. [2]
(d) Explain why the zinc is added in excess and then removed by this method. [2]
(e) Name the salt present in the solution collected as C. [1]
Answer Details
What this tests: the apparatus and correct terms for separating an excess solid from a salt solution by filtration.
(a) [1] A is the (filter) funnel.
(b) [1] B is the filter paper.
(c) [2] The solid left behind on the paper is the residue [1]; the liquid that passes through and is collected as C is the filtrate [1].
(d) Why excess zinc [2] Adding zinc in excess makes sure all the acid is used up, so none is left in the product [1]; the leftover zinc is insoluble, so it can simply be filtered off, leaving a pure salt solution [1].
(e) [1] The salt in solution C is zinc sulfate.
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