C is a mixture of two simple inorganic salts, one of which is a sodium salt.
Perform the following exercises on C. Record your observation and identify any gas(es) evolved. State the conclusions you draw from the results of each test.
(a) Put all of C into a test tube and add about 10 cm\(^3\) of distilled water and shake.
b(i) Put about 2 cm\(^3\) of the filtrate into a boiling tube and heat strongly.
(ii) Put half of the residue into a test tube and add dil. HCl.
(iii) To about 2 cm\(^3\) of the clear solution from b(ii), add aqueous NaOH in drops, then in excess.
(iv) To another 2 cm\(^3\) of the clear solution from b(ii), add aqueous ammonia in drops, then in excess.
| Test | Observation | Inference | |
| (a) | C + 10cm\(^3\) of H\(_2\)O | C partially dissolves | C is a mixture of a soluble and insoluble salt. |
| b(i) | 2cm\(^3\) of filtrate + heat | Colourless and odourless gas in form of bubbles | CO\(_3\)\(^{2-}\) suspected |
| (ii) | residue + t.t + dil. HCl | No visible reaction |
NO\(_3\)\(^-\), SO\(_4\)\(^{2-}\) suspected |
| (iii) | Solution from b(ii) + NaOH in drops and then in excess | White ppt which is dissolves in excess NaOH | Zn\(^{2+}\) , Pb\(^{2+}\) , Al\(^{3+}\) suspected |
| (iv) | Solution from b(ii) + NH\(_3\) in drops and then in excess | White ppt insoluble in excess NH\(_3\) |
Pb\(^{2+}\) confirmed. |
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