MCQ
A solution has $pH = 5$, it is diluted $100 $ times, then it will become
- ✓Neutral
- BBasic
- CUnaffected
- DMore acidic
✓
Answer
Correct option: A.
Neutral
(a) $pH = 5,$ means $[{H^ + }] = {10^{ - 5}}M.$
After dilution $[{H^ + }] = {10^{ - 5}}/100 = {10^{ - 7}}M$
$[{H^ + }]$ from ${H_2}O$ cannot be neglected.
Total $[{H^ + }] = {10^{ - 7}} + {10^{ - 7}} = 2 \times {10^{ - 7}}$
$pH = 7 - 0.3010 = 6.6990 = 7$(neutral).
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The ration of de Broglie wavelengths of a deuterium atom to that of a-particles, when the velocity of the former is 5 times greater than of latter is:
A litre of solution is saturated with $AgCl$. To this solution if $1.0 \times {10^{ - 4}}$ mole of solid $NaCl$ is added, what will be the $[A{g^ + }]$, assuming no volume change
→Which sequence of steps describes the best synthesis of $2-$ phenylpropene ?
→If the difference in electronegativities of two elements is very large, then
When $KMn{O_4}$ acts as an oxidising agent and ultimately forms ${[\,Mn{O_4}]^{ - 2}},\,\,Mn{O_2},\,\,\,M{n_2}{O_3},\,\,M{n^{ + 2}}$ then the number of electrons transferred in each case respectively is
→Relation between $(X)$ and $(Y)$ is
→$1.520\, g$ of the hydroxide of a metal on ignition gave $0.995\, gm$ of oxide. The equivalent weight of metal is
→How many primary amines are possible for the formula ${C_4}{H_{11}}N$
→At $25^{\circ} C$ and 1 atm pressure, the enthalpies of combustion are as given below:
→| Substance | $H _{2}$ | $C ($ graphite $)$ | $C _{2} H _{6}( g )$ |
| $\frac{\Delta_{ C } H ^{\Theta}}{ kJmol ^{-1}}$ | $-286.0$ | $-394.0$ | $-1560.0$ |
The enthalpy of formation of ethane is ........ .
The amount of energy which is released due to addition of extra electron to the outermost orbit of gaseous atom is called