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Chemistry / Chemie - 144
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Calculate the pH of a solution that is 0.239 M in nitrous acid (HNO2) and 1.009 M in potassium nitrite (KNO2). The Ka value of nitrous acid is 4.50 × 10-4. Please give the answer to 2 decimal places. | Bereken die pH van 'n oplossing wat 0.239 M salpeterigsuur (HNO2) en 1.009 M kaliumnitriet (KNO2) bevat. Die Ka waarde van salpeterigsuur is 4.50 × 10-4. Gee asseblief die antwoord tot 2 desimale plekke. |
Consider a buffer solution made up of H2PO4- and HPO42-. What mole ratio of HPO42- / H2PO4- will give a pH of 6.95? Ka = 6.3 x 10-8 Please give the answer to 2 significant figures. | Beskou 'n bufferoplossing wat bestaan uit H2PO4- en HPO42-. Watter molverhouding van HPO42-/ H2PO4- sal 'n pH van 6.95 gee? Ka = 6.3 x 10-8 Gee asseblief die antwoord tot 2 beduidende syfers. |
Determine the pH of a 3.47 M NH4NO3 solution, given that Kb (NH3) = 1.8 x 10-5. Please give the answer to 2 decimal places. | Bepaal die pH van 'n 3.47 M NH4NO3 oplossing, gegee dat Kb (NH3) = 1.8 x 10-5. Gee asseblief die antwoord tot 2 desimale plekke. |
| Determine whether solutions of the following salts are acidic, basic or neutral. | Bepaal of oplossings van die volgende soute suur, basies of neutraal is. |
| HA is a weak acid. Which equilibrium corresponds to the equilibrium constant, Kb, for A-? | HA is 'n swak suur. Watter ewewig stem ooreen met die ewewigskonstante, Kb, vir A-? |
How many grams of the weak acid HF (molar mass = 20.01 g/mole) does it take to prepare 705 mL of a solution that has pH = 3.33? Ka (HF) = 7.1 x 10-4 Please give the answer to 2 decimal places. | Hoeveel gram van die swak suur HF (molêre massa = 20.01 g/mol) neem dit om 705 mL oplossing met pH = 3.33 voor te berei? Ka (HF) = 7.1 x 10-4 Gee asseblief die antwoord tot 2 desimale plekke. |
A certain monoprotic acid is used in industry for manufacturing plastics, adhesives and paints. A 0.22 M solution of the acid has a pH of 2.91. What is Ka for this acid? Please give the answer in scientific notation to 2 significant figures e.g. 3.5E-7 | 'n Sekere monoprotiese suur word in die industrie gebruik vir die vervaardiging van plastiek, kleefmiddels en verf. 'n 0.22 M oplossing van die suur het 'n pH van 2.91. Wat is Ka vir hierdie suur? Gee asseblief die antwoord in wetenskaplike notasie aan 2 beduidende syfers bv.3.5E-7 |
A certain weak acid (pKa = 5.96) is used as a food preservative. Determine the pH of a 0.65 M solution. Please give the answer to 2 decimal places. | 'n Sekere swak suur (pKa = 5.96) word as voedsel preserveermiddel gebruik. Bepaal die pH van 'n 0.65 M oplossing. Gee asseblief die antwoord tot 2 desimale plekke. |
Calculate the % ionization for hypochlorous acid, HClO (0.86 M), which is generated by white blood cells and able to kill bacteria (Ka = 2.9 x 10-8). Please give the answer to 3 decimal places. | Bereken die % ionisasie vir hipochlorigsuur, HClO (0.86 M), wat deur witbloedselle gegenereer word en bakterieë kan doodmaak (Ka = 2.9 x 10-8). Gee asseblief die atwoord tot 3 desimale plekke. |
A monoprotic weak acid is 4.68 % ionized in a 1.52 M solution. Determine the equilibrium proton concentration for this acid. Please give the answer to 3 significant figures. | 'n Monoprotiese swak suur word 4.68 % geïoniseer in 'n 1.52 M oplossing. Bepaal die ewewig proton-konsentrasie vir hierdie suur. Gee asseblief die antwoord tot 3 beduidende syfers. |