Match the columns by identifying the correct chemical formula and the use of the salts.

Salt	Chemical formula	Use
Washing soda	${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$	Fire extinguisher
Gypsum	${\mathrm{NaHCO}}_3$	Fungicide
Blue vitriol	${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$	Manufacture of Cement
Baking soda	${\mathrm{CaSO}}_4.2{\mathrm{H}}_2\mathrm{O}$	Manufacture of Glass

The $\mathrm{pH}$ values of some substances are given in the table. Analyse the table and answer the question.

Is blood acidic or basic in nature?

The $\mathrm{pH}$ values of some substances are given in the table. Analyse the table and answer the question.

The $\mathrm{pH}$ value of pure milk is $6.4$. Does the $\mathrm{pH}$ value increase or decrease when milk changes to curd. Justify your answer

The $\mathrm{pH}$ values of some substances are given in the table. Analyse the table and answer the question.

Among the substances given in the above table
(i) Which one is strongly basic?
(ii) Which one has weak acidic nature?

Organic acids are present in a number of substances we use in our daily life.

(e.g. Tomato, orange, apple, grapes, curd, etc.)

Identify the organic acids in each of them and tabulate.

Complete the equations of the ionisation of phosphoric acid.

${\mathrm{H}}_3{\mathrm{PO}}_4\to {\mathrm{H}}^{+}+{\mathrm{H}}_2{{\mathrm{PO}}_4}^{–}$ (Dihydrogen phosphate ion)

${\mathrm{H}}_2{{\mathrm{PO}}_4}^{–}\to {\mathrm{H}}^{+}+$ _____ (Hydrogen phosphate ion)

_____ $\to {\mathrm{H}}^{+}+{{\mathrm{PO}}_4}^{3-}$ (phosphate ion)

Write the chemical name of the following salts.

$\mathrm{Mg}({\mathrm{H}}_2{\mathrm{PO}}_4{)}_2$

${\mathrm{MgHPO}}_4$

${\mathrm{Mg}}_3({\mathrm{PO}}_4{)}_2$

Solution of sodium carbonate, potassium chloride, and ammonium sulphate are taken in separate beakers. 

Recall the colour change of litmus paper in each solution and tabulate.