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Chemistry / Chemie - 144
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| Calculate the molar solubility of Ag2SO4 when dissolved in water (Ksp = 2.5 x 10-5) (Please give your answer with 2 significant figures.) | Bereken die molêre oplosbaarheid van Ag2SO4 wanneer dit opgelos is in water (Ksp = 2.5 x 10-5). (Gee asb jou antwoord met 2 beduidende syfers.) |
| The Ksp value for magnesium carbonate, MgCO3, is 7.4 x 10-6. If 2.50 g of magnesium carbonate is placed in 1.00 x 102 mL of water, how much (in g) magnesium carbonate will dissolve? (Please provide your answer with 2 significant figures.) | Die Ksp waarde vir magnesium karbonaat, MgCO3, is 7.4 x 10-6. Indien 2.50 g magnesium karbonaat geplaas word in 1.00 x 102 mL water, hoeveel (in g) magnesium karbonaat sal oplos? (Gee asb jou antwoord met 2 beduidende syfers.) |
When SrF2, strontium fluoride, is added to water, the salt dissolves to a very small extent according to the reaction below. At equilibrium the concentration of Sr2+ is found to be 0.00192 M. What is the value of Ksp for SrF2? (Please give your answer with 2 significant figures.) | Wanneer SrF2, stronsiumfluoried, by water gevoeg word, los die sout baie effens op na aanleiding van die reaksie hieronder. By ewewig is die konsentrasie van Sr2+ bepaal as 0.00192 M. Wat is die waarde van Ksp vir SrF2? (Gee asb jou antwoord met 2 beduidende syfers.) |
| SrF2(s) ⇌ Sr2+(aq) + 2 F-(aq) |
A 33.8 mL sample of 0.120 M HCℓO4 is titrated with a 0.140 M KOH solution. What is the pH after the addition of 59.7 mL of KOH? Please give the answer to 2 decimal places. | ‘n 33.8 mL monster van 0.120 M HCℓO4 is getitreer met ‘n 0.140 M KOH oplossing. Wat is die pH na die byvoeging van 59.7 mL KOH? Gee asseblief die antwoord tot 2 desimale plekke. |
What volume (mL) of 0.025 M HNO3 is necessary to titrate 16.4 mL of 0.055 M Ca(OH)2 solution to the endpoint? Please give the answer to 1 decimal place. | Watter volume (mL) 0.025 M HNO3 is nodig om 16.4 mL van 0.055 M Ca(OH)2 oplossing te titreer tot by endpunt? Gee asseblief die antwoord tot 1 decimal place. |
What is the pH of the solution that results from adding 40.9 mL of 0.150 M HCℓ to 49.2 mL of 0.650 M NH3? Please give your answer to 2 decimal places. | Wat is die pH van ’n mengsel wat berei is deur 40.9 mL van ’n 0.150 M HCℓ en 49.2 mL van ’n 0.650 M NH3 oplossing te meng? Gee asb jou antwoord tot 2 desimale syfers. |
What is the pH of the buffer that results when 2.49 g of NH3 and 6.46 g of NH4Cl are dissolved in 250 mL water? (Ka for NH4+ = 5.60 × 10-10) Please give the answer to 2 decimal places. | Wat is die pH van die buffer wat ontstaan wanneer 2.49 g NH3 en 6.46 g NH4Cl opgelos word in 250 mL water? (Ka vir NH4+ = 5.60 × 10-10) Gee asseblief die antwoord tot 2 desimale plekke. |
| Match the experimental pH values to the most appropriate buffer system: | Pas die eksperimentele pH-waardes by die geskikste bufferstelsel: | |||||||||||
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Which one of the following solutions has the greatest buffering capacity? | Watter een van die volgende oplossings het die grootste bufferkapasiteit? |
In a buffer solution, if [A-] > [HA], which of the following must be true? (HA is a general weak acid.) | In 'n buffer oplossing, as [A-] > [HA] is, moet watter van die volgende waar wees? (HA is 'n algemene swak suur.) |