17. Acid and Base Equilibrium

pH of Weak Bases

Scelta multipla
What is the pH of a 0.225 M (CH3)2NH2Br solution, given that the Kb of (CH3)2NH is 5.4 × 10⁻⁴?
810
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Scelta multipla
An unknown weak base has an initial concentration of 0.750 M with a pH of 8.03. Calculate its equilibrium base constant.
1275
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1
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Domanda aperta
Morphine is a weak base. a 0.150 m solution of morphine has a pH of 10.5. What is the K_b for morphine?
1720
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Domanda aperta
What is the [OH⁻] of a 1.40 m solution of pyridine (C₅H₅N, K_b = 1.70 × 10⁻⁹)?
975
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Scelta multipla
For a solution that is 0.164 M NH3 and 0.110 M NH4Cl, calculate the concentration of [H3O+].
652
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Domanda aperta
What is the pH of a 0.320 M solution of Ca(NO₂)₂ (ka of HNO₂ is 4.5 × 10^-4)?
1067
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Scelta multipla
What is the expression for the equilibrium constant (Kb) for the dissociation of a weak base in water?
745
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Scelta multipla
Calculate the pH of a 0.021 M NaCN solution. Given that the Ka of HCN is 4.9 × 10^−10, what is the pH of the solution?
695
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Scelta multipla
What is the pH of a 0.280 M solution of (CH_3)_2NH (dimethylamine)? The K_b of (CH_3)_2NH is 5.4 \(\times\) 10^{-4}.
120
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Scelta multipla
What is the pH of a 0.400 M solution of NaF, given that the Kb of F- is 1.4 x 10^-11?
659
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Domanda aperta
Determine the pH of a 0.227 M C₅H₅N solution at 25 °C. The K_b of C₅H₅N is 1.7 x 10^-9.
762
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Scelta multipla
15.3 grams of sodium benzoate is dissolved in 250 mL of water. What is the pH of the resultant solution if the Kb of benzoate ion is 1.5 x 10^-10?
792
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Scelta multipla
What is the pH of a 0.1 M solution of ammonia (NH3), a weak base with a Kb of 1.8 x 10^-5?
870
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Scelta multipla
Calculate the pH of a solution that is 0.0190 M in NaOH and 0.0870 M in sodium acetate (K_a for CH_3COOH = 1.75 x 10^-5). What is the pH?
664
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Scelta multipla
What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M methylamine, CH3NH2, with 25.00 mL of 0.10 M methylammonium chloride, CH3NH3Cl? Assume that the volume of the solutions are additive and that Kb = 3.70 × 10⁻⁴ for methylamine.
662
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