Write word equations and then balanced equations for the reaction taking place when -
$(a)$ dilute sulphuric acid reacts with zinc granules.
$(b)$ dilute hydrochloric acid reacts with magnesium ribbon.
$(a)$ Sulphuric acid $+$ Zinc $\rightarrow$ zinc sulphate $+$ Hydrogen
${{H}_{2}}S{{O}_{4(aq)}}\,+Z{{n}_{(s)}}\to ZnS{{O}_{4(aq)}}\,+\,{{H}_{2(g)}}$
$(b)$ Hydrochloric acid $+$ Magnesium $\rightarrow$ Magnesium chloride $+$ Hydrogen
$2HC{{l}_{(aq)}}+M{{g}_{(s)}}\to MgC{{l}_{2(aq)}}+{{H}_{2(g)}}$
How is the concentration of hydroxide ions $(OH^-)$ affected when excess base is dissolved in a solution of sodium hydroxide ?
What effect does the concentration of $H^+_{(aq)}$ ions have on the nature of the solution ?
Why does dry $HCl$ gas not change the colour of the dry litmus paper ?
Metal compound $A$ reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
Fresh milk has a $pH$ of $6$. How do you think the $pH$ will change as it turns into curd ? Explain your answer.