August 28‚ 2009 [PROBLEM SET FROM R. CHANG TEST BANK] Chapter 16 Acid-Base Equilibria and Solubility Equilibria Student: ___________________________________________________________________________ NOTE: A table of ionization constants and Ka’s is required to work some of the problems in this chapter. 1. In which one of the following solutions will acetic acid have the greatest percent ionization? A. B. C. D. 2. Which one of the following is a buffer solution? A. B. C. D. E. 3. 0.40 M HCN and
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main aim of the experiment is to find out the amount of calcium carbonate in toothpaste through back titration since calcium carbonate does not dissolve in water. A roughly weighed amount of calcium carbonate is mixed with hydrochloric acid and then titrated against sodium hydroxide. When the indicator turns from pink to orange‚ the volume of sodium hydroxide used is taken down. After doing some calculations‚ the average percentage of calcium carbonate in toothpaste is 19.2%. This average percentage
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PRACTICALS) Q4.How would you distinguish between the following: a)Calcium nitrate and lead nitrate using ammonium hydroxide Ans: Add ammonium hydroxide to the given substance‚ calcium nitrate does not form any ppt. with ammonium hydroxide. But lead nitrate forms chalky white ppt. With ammonium hydroxide b)Calcium nitrate and lead nitrate using sodium hydroxide solution Ans: Add sodium hydroxide to the given substance‚ Calcium nitrate forms milky white ppt. which is insoluble in excess. Lead
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aluminum potassium sulfate salt in a sample of impure scrap aluminum from a common beverage can. The sample will be passed through a filter paper using a funnel‚ after being boiled on a hot plate in a fume hood and dissolved in a solution of potassium hydroxide to remove the impurities. By adding an excess of sulfuric acid and cooling the solution in an ice bath‚ the technique of vacuum filtration using a Buchner funnel will be employed‚ crystals of the hydrated aluminum potassium sulfate salt will yield
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What mass of chlorine was present in the sample? A. 0.127 g B. 0.355 g C. 0.994 g D. 1.01 g Question 10 (2009) The level of carbon dioxide in the air in a spacecraft can be controlled by passing the air through canisters containing lithium hydroxide‚ LiOH. In a laboratory trial‚ the air in a 5.00 L container at 1.10 × 102 kPa and 25.0°C was passed through a canister of LiOH. The pressure of the air in the container decreased to 1.00 × 102 kPa‚ measured at 25.0°C. The mass of CO2 absorbed from
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maximum (ppm) | Chloride | 20 | 400 | Sulfate | 8 | 400 | Nitrate | 0.4 | 10 | Fluoride | 1 | 1.7 | Sodium | 10 | 300 | Calcium | 9 | 200 | Aluminium | 0.2 | 0.2 | * The concentration of sodium (Na+) and chloride (Cl-) ions are important indicators of the salinity of a water system‚ and also affect the taste of water * Magnesium and calcium ions are indicators of water hardness * Phosphate and nitrate ions need to be monitored to prevent eutrophication of a water system
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titration with sodium hydroxide solution. Use data to calculate the Freundlich constants Extend to other acids such as methanoic‚ propanoic‚ ethanedioic acids Starter page Internet sources Project more suitable for students with a mathematical background 14 The amount of copper in brass Compare different methods for finding the concentration of copper(II) ions in solution. Could include redox titration‚ colorimetry‚ ion exchange followed by acid/base titration‚ gravimetric‚ use of an electrochemical
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Section A (Answer ALL questions in this Section.) 1. Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger than that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory. (d) Suggest ONE safety precaution for handling
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SPM CHEMISTRY REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Panel : 1. 2. 3. 4. June Ling S J Chen Soo Chien Felix Ngui Jong Kah Yin SMK St Joseph‚ Kuching Kolej DPAH Abdilah‚ Kuching SMK Tabuan Jaya‚ Kuching SM Sains Kuching REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Page Compiled and edited by : Jong Kah Yin 1 SPM CHEMISTRY INDEX CONTENT 1 REVISION CHECK-LIST Form 4 Form 5 2 WRITING EQUATIONS 2.1 Charges of ions 2.2 Formulae of compounds
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1. In the first group of four reactions‚ Iron phosphate and calcium phosphate are the two products that are insoluble in water. In the three of the four reactions a cloudy white or yellow formed. This indicated the formation of a precipitate‚ caused by the generally insoluble phosphate anion. Potassium chloride‚ Iron nitrate‚ and potassium sulfate where the products which were soluble in water. With these products there was no evidence of a precipitate forming. 2. Based on the results from reactions
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