F is an inorganic salt. Carry out the following exercises on F. Record your observations and identify any gas(es) evolved. State the conclusions you draw from the results of each test.
(a) Transfer F into a test tube and add dil. HCl to it until a clear solution is obtained.
(b) Divide the clear solution obtained from (a) into two portions
(i) To the first portion add NaOH\(_{(aq)}\) in drops and then in excess.
(ii) To the second portion, add few drops of potassium hexacyanoferrate (II) solution.
F = (NH\(_4\))\(_2\)CO\(_3\)
| TEST | OBSERVATION | INFERENCE | |
| (a) | F + t.t + dil. HCl |
Effervescence of colourless, odourless gas. Evolved gas turned lime water milky |
CO\(_2\) from CO\(_3\)\(^{2-}\) or HCO\(_3\) confirmed. |
| b(i) |
1st portion + t.t + NaOH in drops and
then in excess + heat to warm |
No visible reaction, No ppt was also formed Effervescence of a colourless gas with an irritating smell. Gas turned red litmus to blue,also produced white fumes with conc. HCl |
NH\(_3\) from NH\(_4\)\(^+\) confirmed. |
| (ii) | 2nd portion + t.t + few drops of potassium hexacyano ferrate(II) solution | No ppt formed and no visible reaction was observed |
Fe\(^{2+}\)/ Fe\(^{3+}\) absent |
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