COMEDK · Chemistry · 8. Ionic Equilibrium
A buffer solution has equal volumes of \(0.1 \mathrm{M}\) \(\mathrm{NH}_4 \mathrm{OH}\) and \(0.01 \mathrm{M} \mathrm{NH}_4 \mathrm{Cl}\). The \(\mathrm{pK}\) of the base is 5 . The \(\mathrm{pH}\) is
- A 10
- B 9
- C 4
- D 7
Answer & Solution
Correct Answer
(A) 10
Step-by-step Solution
Detailed explanation
\(\mathrm{pOH}=p K_b+\log \frac{[\text { Salt }]}{[\text { Base }]}\) \(\begin{aligned} & =5+\log \frac{0.01}{0.01}=5+\log \frac{1}{10}=5+(-1)=4 \\ & \mathrm{pH}=14-\mathrm{pOH}=14-4=10\end{aligned}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Sodium dissolves in liquid \(\mathrm{NH}_{3}\) to give a deep blue solution. This is due toCOMEDK 2014 Easy
- A buffer solution has equal volumes of \(0.1 \mathrm{M}\) \(\mathrm{NH}_4 \mathrm{OH}\) and \(0.01 \mathrm{M} \mathrm{NH}_4 \mathrm{Cl}\). The \(\mathrm{pK}\) of the base is 5 . The \(\mathrm{pH}\) isCOMEDK 2023 Medium
- When 0.1 mole of \(\mathrm{MnO}_4{ }^{2-}\) is oxidised, the quantity of electricity required to completely oxidise \(\mathrm{MnO}_4{ }^{2-}\) to \(\mathrm{MnO}_4^{-}\) isCOMEDK 2024 Easy
- A buffer solution was prepared by mixing 5 g of acetic acid with 7.5 g of sodium acetate. The solution was made upto 500 mL . The pH of the resulting solution is:
\(\left[p K_a=4.76\right]\)COMEDK 2025 Medium - \(\mathrm{Ti}^{2+}\) is purple while \(\mathrm{Ti}^{4+}\) is colourless becauseCOMEDK 2023 Medium
- The standard electrode potential for Daniell cell is \(1.1 \mathrm{~V}\). What is the standard Gibbs energy for the reaction?COMEDK 2015 Easy
More PYQs from COMEDK
- One coolie takes \(1\mathrm{min}\) to raise a suitcase through a height of \(2 \mathrm{~m}\) but the second coolie takes \(30 \mathrm{~s}\) to raise the same suitcase to the same height. The powers of two coolies are in the ratio.COMEDK 2013 Easy
- The domain of the function
\(f(x)=\log (1-x)+\sqrt{x^{2}-1}\)COMEDK 2012 Easy - The velocity constant of a reaction at \(290 \mathrm{~K}\) was found to be \(3.2 \times 10^{-3} \mathrm{~s}^{-1}\). When the temperature is raised to \(310 \mathrm{~K}\), it will be aboutCOMEDK 2016 Easy
- A \(500 \mathrm{~W}\) heating unit is designed to operate on a \(400 \mathrm{~V}\) line. If line voltage drops to \(160 \mathrm{~V}\), the percentage drop in heat output will be:COMEDK 2024 Medium
- If \(\frac{x^{2}}{36}-\frac{y^{2}}{k^{2}}=1\) is a hyperbola, then which of the following statements can be true?COMEDK 2020 Easy
- The maximum current that can be measured by a galvanometer of resistance \(40 \Omega\) is \(10 \mathrm{~mA}\). It is converted into a voltmeter that can read upto \(50 \mathrm{~V}\). The resistance to be connected in series with the galvanometer (in ohm) isCOMEDK 2019 Medium