- [Medium]For the weak acid HA (Ka = 4.0×10⁻⁷), which expression best gives [H+] in a solution of initial concentration C where C ≫ Ka?...
- [Easy]Which equation correctly represents the autoionization of water?...
- [Easy]Calculate the pH of a 0.020 M Ba(OH)2 solution at 25°C (assume complete dissociation)....
- [Medium]Which statement about buffer capacity is correct?...
- [Hard]The pH of a very dilute strong acid (1.0×10⁻⁸ M HCl) at 25°C is closest to:...
- [Medium]If the ionic product of water increases with temperature, which statement is correct?...
- [Easy]The conjugate acid of (CH3)3 N is:...
- [Medium]Which factor most strongly determines whether an amphoteric species acts as an acid or a base in water?...
- [Hard]A 0.10 M solution of a weak base B has Kb = 2.5×10⁻⁴. The pOH of the solution is approximately:...
- [Medium]The percent dissociation of a 1.0×10⁻³ M solution of a weak monoprotic acid (Ka = 1.0×10⁻⁵) is approximately:...
- [Medium]Which change increases the pH of an acetic acid/sodium acetate buffer the most?...
- [Easy]Calculate [H+] (in mol L⁻¹) after mixing 25 mL of 0.040 M HCl with 75 mL of water (assume volumes additive)....
- [Medium]Which of the following aqueous salts gives a solution with pH ≈ 7 at 25°C?...
- [Hard]Given Ka values: HF (6.8×10⁻⁴), HCN (6.2×10⁻¹⁰), HCOOH (1.8×10⁻⁴), Phenol (1.1×10⁻⁻⁰). Increasing order of conjugate base strength is:...
- [Medium]A buffer is made by mixing 0.10 M acetic acid and 0.20 M sodium acetate. (Ka for acetic acid = 1.8×10⁻⁵). The pH of the buffer is (25°C):...
- [Easy]50 mL of 0.10 M HCl is mixed with 25 mL of 0.20 M NaOH at 25°C. The pH of the resulting solution is:...
- [Easy]A 0.005 M solution of HNO3 (strong acid) is prepared at 25°C. Assuming complete dissociation, the pH of the solution is:...