Kw in pure water at 10°C is 5.03 x 10-15. What is the pH of pure water at 10 °C? (the answer should be entered with 3 significant figures; do not enter units; give answer in normal notation--examples include 1.23 and 120. and -123 and 123. and 12.3) MacBook Pro esc ! %23 2$ 1 2 3 4 7 8 9 delete Q E R { Y U P tab S F G J K caps lock return > ? C V M shift shift fn control option command command option .. .. V

Kw in pure water at 10°C is 5.03 x 10-15. What is the pH of pure water at 10 °C? (the answer should be entered with 3 significant figures; do not enter units; give answer in normal notation--examples include 1.23 and 120. and -123 and 123. and 12.3) MacBook Pro esc ! %23 2$ 1 2 3 4 7 8 9 delete Q E R { Y U P tab S F G J K caps lock return > ? C V M shift shift fn control option command command option .. .. V

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 107AP

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when chlorine gas is added to water during the disinfection of drinking water, it hydrolyzes with the water to form HOCL. The disinfection power of the acid HOCL is 88 times better than its conjugate base, OCl-. The pKa for HOCl is 7.5. (a) what percentage of the total disinfection power exists in the acid form at pH of 6?
A solution of acetic acid CH3COOH, on a laboratory shelf was of undetermined concentration. If the pH of the solution was found to be 2.68, what was the initial concentration of the acid? Ka=1.7x10-5 Ethanolamine, HOC2H4NH2, is a viscous liquid with an ammonia-like odour used to remove hydrogen sulphide from natural gas. A 0.15 mol dm-3 aqueous solution of ethanolamine has a pH of 11.34. What is kb for ethanolamine? What is the concentration of hydroxide ion in a 0.060 mol dm-3 aqueous solution of methylamine, CH3NH2? What is the pH? Kb=4.4x10-4
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A 250 cm3 volumetric flask contains exactly 200,0 cm3 of a 0,025 mol.dm3sulphuric acid solution. Thereafter ten (10) sodium hydroxide pellets, eachof mass 0,1 g are dropped into the flask. After the pellets have dissolvedcompletely, the flask is topped to the 250 cm3 mark with water and thecontents are thoroughly homogenised. Determine the pH of the resultingsolution.
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14. Acetic acid is a weak acid with the formula CH3COOH; the Ka for acetic acid is 1.76 x 10-5 In aqueous solution, acetic acid partially dissociates according to the following reaction: CH3COOH + H2O ⇔ CH3COO- + H3O+ Calculate the pH of the acetic acid solution described below: Volume: 100 mL Concentration: 0.1708 M Since this is a weak acid, you can assume the amount of acid dissociated is << 5% of the total amount of acid present. a 3.26 b 1.77 c 2.76 d 2.00 e 0.77
Click in the Stockroom. The stock solutions of NaCN and Na3PO4 are already approximately 0.1 M. Double-click each bottle to move them to the counter and return to the laboratory. With these solutions you can pour a small amount into a beaker that you have placed on the stir plate and place the pH probe in the solution. Record each pH in the data table. Drag each beaker to the red disposal bucket when you have finished. Were your predictions correct? If not, re-write the balanced net ionic equation below and explain the behavior of the salt in water.                  Data Table solution pH acidic, basic or neutral NH4Cl NaHCO3 KNO3 NaCN Na3PO4
Calculate the pH of a solution containing a salt AcNa derived from a strong base (NaOH) and a weak acid (AcH), like CH3COONa, KF, NaNO2 and so on. In this case two processes have to be considered: 1. Dissociation of the salt, within the assumption that the salt is a strong electrolyte:      AcNa → Ac- + Na+,   for instance: CH3COONa → CH3COO- + Na+ 2. the hydrolysis of the water      Ac- + H2O ⇌ AcH + OH-,    for example: CH3COO- + H2O ⇌ CH3COOH + OH- knowing that the initial concentration of the salt is 1.95 M and the acid dissociation constant, Ka , is 1.21e-7.
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Hydroxylamine HONH2 readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps . Hydroxylamine has Kb of 9.1 x 10^-9 . What is the pH of a 0.073 M HONH2? Report 2 decimal places
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