Practical Info

Alert

The following formulas are written in LaTeX, and this is the first time it’s ever being used in this document (or across all my documents). So, the implementation may be buggy, and you may need to scroll sideways or double-click to see the full formula.

#2 - The exams have been postponed to January.

by Sugeeth Jayaraj Samala Augustine (talk)

Basic Radical Tests (Chlorine - Confirmatory)

The order of adding the compounds is really important.

1. Test for Chlorine - Nitric Acid Test

$$Salt \; solution + Conc. \; HNO_3 + AgNO_3 \longrightarrow\ White \; ppt \; formation.$$

1. Test for Chlorine - Evolution of Gas test. Heat the following reactants in a test tube for the product to form.

$$Salt \; solution + MnO_2 + Conc. \; H_2 SO_4 \longrightarrow Cl_2 \; gas \; evolved.$$

1. Another Confirmatory Test for Chlorine: (original text before correction by “ur dad”: Another Test… IDK what’s this for…)

$$Salt \; Solution + Solid \; K_2 Cr_2 O_7 + Conc. \; H_2 SO_4 \longrightarrow Red \; Vapour + \mathbf{Resultant \; Solution}$$

Now take the resulting solution and do this reaction.

$$\mathbf{Resultant} + NaOH + dil. \; CH_3COO + Lead \; Acetate \longrightarrow Yellow \; PPT$$

Acid Radical (Calcium)

The order of the tests matter.

1. The Calcium Flame Test - Take some salt on a spatula and burn it. If the flame colour is brick red, it’s probably Calcium

2. Group Separation Tests:

   The tests are in the observation note. However, for the Group 5 test, the order of adding the compounds matter. The correct order is: (not given in note)

$$Salt \; solution + [NH_4]_2 CO_3 + NH_4 Cl + NH_4 OH \longrightarrow White \; PPT \; formed + \mathbf{Resultant \; Solution}$$

1. Confirmatory Test:

$$\mathbf{Resultant} + Ammonium \; Orlate \longrightarrow White \; ppt$$

Thus, the evolution of White ppt confirms the presence of Ca.

…for $CaCl_2$