Write an equation to show the reaction between Plaster of Paris and water.
The chemical equation for the reaction of Plaster of Paris and water can be represented as
$\underset{Plaster\,\,of\,\,Paris}{\mathop{CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O}}\,\,+\underset{Water}{\mathop{1\,\frac{1}{2}{{H}_{2}}O}}\,\,\to \,\underset{Gypsum}{\mathop{CaS{{O}_{4}}.2{{H}_{2}}O}}\,$
Write word equations and then balanced equations for the reaction taking place when -
$(a)$ dilute sulphuric acid reacts with aluminium powder.
$(b)$ dilute hydrochloric acid reacts with iron filings.
Name the sodium compound which is used for softening hard water.
Why should curd and sour substances not be kept in brass and copper vessels ?
Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.
A solution turns red litmus blue, its $pH$ is likely to be