COMEDK · Chemistry · 8. Ionic Equilibrium
The \(\mathrm{pH}\) of \(10^{-8} \mathrm{M} \mathrm{HCl}\) solution is
- A 8
- B more than 8
- C between 6 and 7
- D slightly more than 7
Answer & Solution
Correct Answer
(C) between 6 and 7
Step-by-step Solution
Detailed explanation
\(\mathrm{pH}=-\log \left[\mathrm{H}^{+}\right]\) \[ \begin{aligned} {\left[\mathrm{H}^{+}\right] } &=10^{-8}+10^{-7}=1.1 \times 10^{-7} \\ \mathrm{pH} &=-\log \left(1.1 \times 10^{-7}\right) \\ \mathrm{pH} &=7-\log (1.1) \end{aligned} \] \(\therefore\) It is between 6 and 7 .
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
- For the reaction, \(\mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \longrightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2}\), the volume of carbon monoxide required to reduce one mole of ferric oxide isCOMEDK 2017 Medium
- The ratio of average velocity of a gas molecule to the root mean square velocity at a particular temperature isCOMEDK 2023 Easy
- Which of the following is wrongly matched?COMEDK 2016 Medium
- Choose the correct statement from the options givenCOMEDK 2025 Easy
- Cationic complex isCOMEDK 2019 Medium
- An aliphatic compound [X], Molecular formula (\(\text{C}_4\text{H}_{10}\text{O}\)) can be prepared from Acetone and R– Mg–X. [X] with 20% Phosphoric acid gives an unsaturated compound \(\text{C}_4\text{H}_8\) [Y]. Compound [Y] is also obtained on heating [X] with Copper metal at 573K. [X] shows no reaction with PCC but on heating with acidified \(\text{KMnO}_4\) it forms Acetone + \(\text{CO}_2\) + \(\text{H}_2\text{O}\). Compounds [X] and [Y] are -------------------- and --------------------COMEDK 2026 Medium
More PYQs from COMEDK
- A negative charge particle is moving upward in a magnetic field which is towards north. The particle is deflected towardsCOMEDK 2024 Easy
- Identify the two incorrect electrochemical reactions shown as taking place in the given cells at the respective electrodes.
Cell Electrode Reaction Lead-Storage Cell Cathode \(Pb + 2SO_4^{2-} + 4H^+ + 2e^- \to PbSO_4 + 2H_2O + SO_2\) Leclanche Cell Cathode \(MnO_2 + NH_4^+ + 2e^- \to MnO + OH + NH_3\) Mercury Cell Anode \(Zn/Hg + 2OH^- \to ZnO(s) + H_2O + 2e^-\) Fuel Cell Cathode \(O_2(g) + 2H_2O + 4e^- \to 4OH^-\) COMEDK 2025 Medium - If \(A\) and \(B\) are events, such that \(P(A)=\frac{1}{4}\) \(P\left(\frac{A}{B}\right)=\frac{1}{2}\) and \(P\left(\frac{B}{A}\right)=\frac{2}{3}\) then \(P(B)\) isCOMEDK 2024 Medium
- What is the standard electrode potential at 298 K for the reaction: \(\mathrm{Cu}^{2+}+1 \mathrm{e}-\rightarrow \mathrm{Cu}^{+1}\) ?
Given: \(\mathrm{E}_0 \mathrm{Cu}^{+1} / \mathrm{Cu}=0.5 \mathrm{~V} \quad \& \quad \mathrm{E}_0 \mathrm{Cu}^{+2} / \mathrm{Cu}=0.335 \mathrm{~V}\)COMEDK 2025 Medium - The length of \(y\)-intercept of the circle \(x^2+y^2-6 x+4 y+3=0\) isCOMEDK 2024 Easy
- Which of the following is a correct match?COMEDK 2026 Easy