Five solutions $A,\,B,\,C,\,D$ and $E$ when tested with universal indicator showed $pH$ as $4,\,1,\,11,\,7$ and $9$, respectively. Which solution is
$(a)$ neutral ?
$(b)$ strongly alkaline ?
$(c)$ strongly acidic ?
$(d)$ weakly acidic ?
$(e)$ weakly alkaline ?
Arrange the $pH$ in increasing order of hydrogen-ion concentration.
$(a)$ Neutral $\rightarrow$ Solution $D$ with $pH\, 7$
$(b)$ Strongly alkaline $\rightarrow$ Solution $C$ with $pH\, 11$
$(c)$ Strongly acidic $\rightarrow$ Solution $B$ with $pH \,1$
$(d)$ Weakly acidic $\rightarrow$ Solution $A$ with $pH \,4$
$(e)$ Weakly alkaline $\rightarrow$ Solution $E$ with $pH \,9$
The $pH$ can be arranged in the increasing order of the concentration of hydrogen ions as:
$11 < 9 < 7 < 4 < 1$
Why does an aqueous solution of an acid conduct electricity?
What is a neutralisation reaction? Give two examples.
Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.
How is the concentration of hydronium ions $(H_3O^+)$ affected when a solution of an acid is diluted ?
Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate) ?