Determine the pH of each of the following solutions. (a) 0.134 M hypochlorous acid (weak acid with Ka = 3e-08). (b) 0.283 M hydrazoic acid (weak acid with Ka = 1.9e-05). (c) 0.879 M pyridine (weak base with Kb = 1.7e-09).
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- The formula for tartaric acid is preferably written as H2C4H4O6 rather than as C4H6O6. Explain why.Determine the pH of each of the following solutions.(a) 0.762 M hypobromous acid (weak acid with Ka = 2.5e-09).(b) 0.558 M hydrosulfuric acid (weak acid with Ka = 9.5e-08).(c) 0.543 M pyridine (weak base with Kb = 1.7e-09).Determine the pH of each of the following solutions.(a) 0.257 M hypobromous acid (weak acid with Ka = 2.5e-09).(b) 0.809 M ascorbic acid (weak acid with Ka = 8e-05).(c) 0.555 M pyridine (weak base with Kb = 1.7e-09).
- 6. (i) Define pH in words. The strong acid HClahas a pH value of 1, use the following equation for a strong acid: H+, + and convert the following expression to deduce the hydrogen ion concentration: pH = -log10 [H*] (ii) Use the above expression to deduce the pH of HCL (ag) given the concentration of the acid to be 4.5 mol/dm3 pH =8) What is the pH of a 0.035 M HNO, solution? HNO3 (aq) + H,0 (1) H;O* (aq) + NO; (aq)Q3. This question is about the pH of several solutions. Give all values of pH to 2 decimal places. (a) (i) Write an expression for pH. (b) (ii) Calculate the pH of the solution formed when 10.0 cm³ of 0.154 mol dm-³ hydrochloric acid are added to 990 cm³ of water. The acid dissociation constant, Ka, for the weak acid HX has the value 4.83 x 10-5 mol dm-³ at 25 °C. A solution of HX has a pH of 2.48 Calculate the concentration of HX in the solution. Page 4 of 14
- The pH scale for acidity is defined by pH – log10 H*| where |H*| is the concentration of hydrogen ions measured in moles per liter (M). (A) The pH of Drano is 13.3. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M (B) The pH of rain water is 5.5. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M(i) Define pH in words. The strong acid HClaq has a pH value of 1, use the following equation for a strong acid: HClaq à H+aq + Cl-aq and convert the following expression to deduce the hydrogen ion concentration: pH = -log10 [H+] (ii) Use the above expression to deduce the pH of HCl (aq) given the concentration of the acid to be 4.5 mol/dm3(i) Define pH in words. The strong acid HClaq has a pH value of 1, use the following equation for a strong acid: HClaq à H+aq + Cl-aq and convert the following expression to deduce the hydrogen ion concentration: pH = -log10 [H+] (ii) Use the above expression to deduce the pH of HCl (aq) given the concentration of the acid to be 4.5 mol/dm3 pH =
- The pH reading of a sample of each substance is given. Calculate the hydrogen ion concentration of the substance. (Give your answers in scientific notation, correct to one decimal place.) (a) Spinach: pH = 5.4 [H+] = 3.98107 -6 x 10 M (b) Crackers: pH = 7.2 [H*] = х 10 M2.2 6. (i) Define pH in words. The strong acid HClaq has a pH value of 1, use the following equation for a strong acid: Haq Claq + HClaq And convert the following expression to deduce the hydrogen ion concentration: pH = -log10 [H+] (ii) Use the above expression to deduce the pH of HCl (aq) given the concentration of the acid to be 4.5 mol/dm³ pH =4. How does the pH of each of the following solutions change when 5.0 mL of 1.0 M NaOH (a strong base) is added? Fill in the table. Give your answers with 2 decimals. Initial pH Final pH after adding NaOH Solution (a) 100.0 ml water (b) (c) 100.0 mL 0.150 M HNO2 (a weak acid) (Given: Ka = 4.5 × 10-4) 100.0 mL solution of 0.150 M HNO2 and 0.100 M NaNO₂
