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Chemistry / Chemie - 144
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Magnesium hydroxide is used as an antacid to relieve indigestion problems and heartburn. What is the pH of a 0.015 M aqueous solution of magnesium hydroxide, Mg(OH)2? (Please give your answer rounded off to 2 decimal places.) | Magnesiumhidroksied word gebruik as teensuurmiddel om spysverteringsprobleme en sooibrand te verlig. Wat is die pH van ʼn 0.015 M waterige oplossing van magnesiumhidroksied, Mg(OH)2? (Gee asb jou antwoord afgerond tot 2 desimale plekke.) |
Bromine gas is used in the insecticide industry. Suppose 0.680 M Br2 is heated to 1756 K, a temperature at which the halogen dissociates to form atoms as demonstrated by the reaction below. If Br2 is 13.3% dissociated at this temperature, calculate K. (Please give your answer with the correct amount of significant figures.) | Broomgas word in die insekdoder industrie gebruik. Veronderstel 0.680 M Br2 word verhit tot by 1756 K, 'n temperatuur waarby die halogeen dissosieer na atome soos gedemonstreer in die reaksie hieronder. Bereken K indien Br2 13.3% gedissosieer is by hierdie temperatuur. (Gee asb jou antwoord met die korrekte aantal beduidende syfers.) |
Br2(g) ⇌ 2 Br(g) |
If, at a particular temperature, Kc = 1.6 for the reaction | Indien, by 'n spesifieke temperatuur, Kc = 1.6 vir die reaksie |
| 2 H2S(g) ⇌ Image failed to load Image failed to load Image failed to load 2 H2(g) + S2(g) |
what is Kc for the reaction below? Give your answer to two significant figures. | wat is Kc vir die reaksie hieronder? Gee jou antwoord met twee beduidende syfers. |
| 5 H2(g) + 5/2 S2(g) ⇌ 5 H2S(g) Image failed to load Image failed to load Image failed to load |
What is the solubility (in mol/L) of CuCl in a solution that also contains 0.027 M CuNO3 (the latter is fully soluble). (Ksp CuCl = 1.0 x 10-6)? Please provide your answer to 2 significant figures. | Wat is die oplosbaarheid (in mol/L) van CuCl in 'n oplossing wat ook 0.027 M CuNO3 bevat (laasgenoemde is ten volle oplosbaar). (Ksp CuCl = 1.0 x 10-6)? Gee asb jou antwoord tot 2 beduidende syfers. |
A buffer system, used as an ingredient for a certain diet soft drink, is prepared by combining 2.00 L of a 0.250 M citric acid solution and 4.00 L of a 0.800 M sodium citrate salt solution. Citric acid has a Ka value of 7.40 x 10-4. What is the pH of the buffer solution? Provide your answer to 2 decimal places. | ʼn Buffersisteem, wat as bestanddeel vir 'n sekere dieetkoeldrank gebruik word, word voorberei deur 2.00 L van 'n 0.250 M sitroensuuroplossing en 4.00 L van 'n 0.800 M natriumsitraat soutoplossing te kombineer. Sitroensuur het ʼn Ka waarde van 7.40 x 10-4. Wat is die pH van die bufferoplossing? Gee jou antwoord tot 2 desimale syfers. |
The solubility for PbCl2 is 0.160 mol/L. What is the value of the Ksp for PbCl2? Please provide your answer with 3 significant figures. | Die oplosbaarheid vir PbCl2 is 0.160 mol/L. Wat is die waarde van die Ksp vir PbCl2? Gee asb jou antwoord met 3 beduidende syfers. |
A buffer system, used as an ingredient for a certain diet soft drink, is prepared by combining 2.00 L of a 0.250 M citric acid solution and 4.00 L of a 0.800 M sodium citrate salt solution. What will the pH of this soda be if 0.200 moles of NaOH is added to it? Ka (citric acid) = 7.40 × 10-4. Provide your answer to 2 decimal places. | ʼn Buffersisteem, wat as bestanddeel vir 'n sekere dieetkoeldrank gebruik word, word voorberei deur 2.00 L van 'n 0.250 M sitroensuuroplossing en 4.00 L van 'n 0.800 M natriumsitraat soutoplossing te kombineer. Wat sal die pH van hierdie koeldrank wees indien 0.200 mol NaOH daarby gevoeg word? Ka (sitroensuur) = 7.40 × 10-4. Gee jou antwoord tot 2 desimale syfers. |
| Briefly explain why you drew the structure above as your answer. | Verduidelik kortliks waarom jy die bogenoemde struktuur as jou antwoord geteken het. |
You need to prepare a buffer solution containing amongst other things 0.300 moles of HF. In addition you have only HBr, CH3COOH, NaOH and NH3 solutions available. Indicate which one of these solutions you will combine with the HF solution in order to produce a buffer solution. Specify whether you will need less, the same or more than 0.300 mol of the second compound and explain briefly how this will be able to produce a buffer. | Jy moet 'n bufferoplossing voorberei wat onder andere 0.300 mol van HF bevat. Jy het daarby net HBr, CH3COOH, NaOH en NH3 oplossings beskikbaar. Dui aan watter een van hierdie oplossings jy met die HF oplossing sal kombineer om 'n bufferoplossing te produseer. Spesifiseer of jy minder, dieselfde of meer as 0.300 mol van die tweede verbinding sal benodig en verduidelik kortliks hoe dit sal werk om 'n buffer te produseer. |
Formic acid, HCOOH, is an organic acid that is found naturally in the bodies of some ants. What is the percent ionization of a 0.770 M solution of formic acid if the pKa value is 3.75? Please provide your answer with 3 significant figures. | Mieresuur, HCOOH, is 'n organiese suur wat natuurlik in die liggame van sommige miere voorkom. Wat is die persentasie ionisasie van 'n 0.770 M oplossing van mieresuur as die pKa waarde 3.75 is? Gee asb jou antwoord met 3 beduidende syfers. |