Acid-base concepts and pH scale

27 questions on Acid-base concepts and pH scale from the Ionic Equilibrium I chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• The conjugate base of HSO4- in the Bronsted-Lowry sense is NEET level
• Which of the following behaves as a Lewis acid? NEET level
• At 298 K, the pH of 0.001 M HCl (completely ionised) is NEET level
• At 298 K a solution has pH = 9.3. Its pOH is NEET level
• Which of the following species is amphiprotic (can both donate and accept a proton)? NEET level
• What is the pH at 298 K of 0.02 M Ba(OH)2 (assume complete dissociation; log 2 = 0.301)? JEE Main level
• Calculate the pH at 298 K of 1.0x10^-8 M HCl, taking the ionisation of water into account (K_w = 1.0x10^-14). Give the answer to two decimals. JEE Main level
• 150 mL of 0.2 M HCl is mixed with 100 mL of 0.1 M NaOH at 298 K. Find the pH of the mixture to two decimals (use log 2 = 0.301). JEE Main level
• At a certain temperature pure water has pH = 6.5. At the same temperature the pH of 0.01 M NaOH is JEE Main level
• Pure water is heated from 298 K to 373 K, where K_w is about 5.5x10^-13. Which statements are correct? JEE Main level
• Which of the following is NOT a conjugate acid-base pair in the Bronsted-Lowry sense? JEE Main level
• 25.0 mL of a strong monoprotic acid of pH 1.30 is diluted with water to 500 mL. Find the pH of the diluted solution to two decimals (10^-1.30 = 0.0501; log 20 =... JEE Main level
• In the complex-forming reaction Ag+ + 2NH3 -> [Ag(NH3)2]+, which statement is correct? JEE Main level
• How many mL of water must be added to 250 mL of a strong acid solution of pH 2 to change its pH to 4 (volumes additive)? Give the answer to the nearest integer. JEE Main level
• Which of the following species can act as both a Bronsted-Lowry acid and a Bronsted-Lowry base? JEE Main level
• 1 L of HCl of pH 2 is mixed with 1 L of HCl of pH 3. The pH of the mixture is (use log 5.5 = 0.740) JEE Main level
• 100 mL of 0.1 M HCl and 200 mL of 0.05 M H2SO4 (treat both protons as completely ionised) are mixed with 100 mL of 0.28 M NaOH. Find the pH to two decimals (log... JEE Advanced level
• Calculate the pH at 298 K of 5.0x10^-8 M NaOH, including the contribution of water (K_w = 1.0x10^-14). Give two decimals. JEE Advanced level
• At a certain temperature K_w = 4.0x10^-14 (log 2 = 0.301). A solution at this temperature has pH 6.9. The solution is JEE Advanced level
• Which of the following reactions are Lewis acid-base reactions that are NOT Bronsted-Lowry acid-base (proton transfer) reactions? JEE Advanced level
• At a temperature where K_w = 1.0x10^-13, how many H+ (hydronium) ions are present in 1.0 mL of pure water? Express as zx10^14 and give z to two decimals (N_A = ... JEE Advanced level
• Equal volumes of NaOH solution of pH 12 and HCl solution of pH 3 are mixed at 298 K. The pH of the mixture is (log 4.5 = 0.653) JEE Advanced level
• 10 mL of HCl of pH 6 is diluted to 100 mL at 298 K. Taking water ionisation into account, the pH of the dilute solution is JEE Advanced level
• For 4.0x10^-8 M HCl at 298 K (K_w = 1.0x10^-14), which statements are correct? JEE Advanced level
• 60 mL of 0.15 M HCl and 80 mL of 0.05 M H2SO4 are mixed with 25 mL of 0.20 M Ba(OH)2. Treating H2SO4 as fully ionised (ignore any precipitate effects on pH) and... JEE Advanced level
• Four solutions at 298 K: P = 0.01 M HCl; Q = 0.01 M weak acid HA, 4% ionised; R = 0.01 M NaOH; S = 0.005 M Ba(OH)2 (log 4 = 0.602). Which statements are correct... JEE Advanced level
• x mL of HCl of pH 1 is added to 100 mL of NaOH of pH 13 (298 K), and the final pH is 12. Volumes are additive. The value of x is JEE Advanced level