Question:
\(4\text{ g}\) of NaOH is dissolved in \(1.0\text{ L}\) solution. The pH of solution is
\(4\text{ g}\) of NaOH is dissolved in \(1.0\text{ L}\) solution. The pH of solution is
Show Hint
For strong bases, first find \([OH^-]\), then calculate \(pOH\), and use \(pH+pOH=14\).
Updated On: May 7, 2026
- \(13\)
- \(1\)
- \(12\)
- \(7.4\)
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Mass of NaOH dissolved is:
\[
4\text{ g}.
\]
Molar mass of NaOH is:
\[
40\text{ g mol}^{-1}.
\]
Number of moles of NaOH:
\[
\text{Moles}=\frac{4}{40}.
\]
\[
=0.1\text{ mol}.
\]
Volume of solution is:
\[
1.0\text{ L}.
\]
Molarity of NaOH:
\[
M=\frac{0.1}{1.0}=0.1M.
\]
NaOH is a strong base, so it dissociates completely:
\[
NaOH\rightarrow Na^+ + OH^-.
\]
Thus,
\[
[OH^-]=0.1=10^{-1}.
\]
Now,
\[
pOH=-\log[OH^-].
\]
\[
pOH=-\log(10^{-1})=1.
\]
We know:
\[
pH+pOH=14.
\]
Therefore,
\[
pH=14-1.
\]
\[
pH=13.
\]
Hence, the pH of solution is:
\[
13.
\]
Was this answer helpful?
0
0
Top AP ECET Chemistry Questions
- Thermal decomposition of $HCOOH$ is a first order reaction and the rate constant at T(K) is $4.606 \times 10^{-3}\, s^{-1}$. The time required to decompose $90\%$ of initial quantity of $HCOOH$ at $T(K)$ in seconds is
- To which group and period does the element belong if the electronic configuration of an element in its $-2$ oxidation state is $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}$ ?
- A solution is prepared by dissolving $10 \,g$ of a non-volatile solute (molar mass, $'M^{\prime} g mol ^{-1}$ ) in $360\, g$ of water. What is the molar mass in $g\, mol ^{-1}$ of solute if the relative lowering of vapour pressure of solution is $5 \times 10^{-3}$ ?
- Reduction of nitrobenzene in the presence of $ \text{Zn/N}{{\text{H}}_{\text{4}}}\text{Cl} $ gives:
- Magnesium is burnt in air to form $A$ and $B$. When $B$ is hydrolysed, $C$ and $D$ are formed. $D$ is the reactant in the manufacture of nitric acid by Ostwald's process. What is $C$
View More Questions
Top AP ECET Ionic Equilibrium In Solution Questions
- How many moles of urea is present in \(250\text{ ml}\) of \(0.2M\) solution of it?
- \(x\text{ ml}\) of \(0.1M\) NaOH solution is diluted with distilled water to get \(250\text{ ml}\) of \(0.01M\) solution. The value of \(x\) in ml is
- \(3\times10^{22}\) molecules of \(Na_2CO_3\) molecular weight \(=106\) present in \(500\text{ ml}\) of solution. The normality of the solution formed is \(\left(N=6\times10^{23}\text{ mol}^{-1}\right)\)
- Identify the pair containing only Lewis acids.
- Aqueous solution of which of the following does not act as electrolyte?
View More Questions
Top AP ECET Questions
- The sum of the four digit even numbers that can be formed with the digits 0,3,5,4 with out repetition is
- Thermal decomposition of $HCOOH$ is a first order reaction and the rate constant at T(K) is $4.606 \times 10^{-3}\, s^{-1}$. The time required to decompose $90\%$ of initial quantity of $HCOOH$ at $T(K)$ in seconds is
- Three rods of same dimensions have thermal conductivities 3 K, 2 K and K. They are arranged as shown below:What will be the temperature T of the junction?
- To which group and period does the element belong if the electronic configuration of an element in its $-2$ oxidation state is $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}$ ?
- A ball of mass 0.6 kg attached to a light inextensible string rotates in a vertical circle of radius 0.75 m such that it has a speed of $ 5\text{ }m{{s}^{-1}} $ when the string is horizontal. Tension in string when it h horizontal on other side is $ (g=10m{{s}^{-}}2) $
View More Questions