Resources indicate with letter nota specific sources can be listed as E F, G,et

Question

Resources indicate with letter nota specific sources can be listed as E F, G,et A. Handbook of Chemistry and Physics (CRC): Hard-copies are in Reference and on electronic version is available to students on a "Uw Restricted" basis. Access is through the Library on line catalog. B. Lange's Handbook of Chemistry: Note: The electronic versions of these two references (A and B) are VERY large files. DO NOT attempt to save or print them!!! C. Merck Index: 12th and 13th Editions in Reference or on Reserve. D. MSDS or SDS. note actual source (Ex's jibaker.com chem ox ac.uk sites, but many others l. Find density (or specific gravity) data for water. Indicate the temperature and density where liquid water has its maximum density to all digits given, and also give the density values for 2°C warmer and cooler. 2. Find the Electrical Conductivity of Aqueous Solutions Table in the CRC. a. If the conductivity of an acid comes from the release of Hydrogen ion(s) from the molecule, which of the following is the most and the least acidic according to their conductivity? Acetic Acid, Citric Acid, Formic Acid, and Phosphoric Acid -list each by it's molecular formula. (Record the data for a specific solution available for all substances say 5.0 solution by mass. Record which concentration you used!) formula conductivity Scm mol rank (1 most ConC FA HCOOH (typos in some sources) CA H3CeHsO7 b. If you had 325 grams of a 5.0 by mass solution of citric acid, how many grams would be the acid and how many grams would be water? How many moles of citric acid would it contain? c. Record the data for a specific solution of Na3PO, NazHPO4, NaH2PO4, KrHPO4 and KHzPO. pid

Explanation / Answer

Ques1) Density data for water has been taken from the referrence books:

Density of water is maximum at 4 and 5 degree Celsius i.e. 1000 kg/m3

Density at 2 degree lesser

Density at the temperature 2 degrees warmer

Ques 2 b) 325 g of 5.00% by mass solution of citric acid

(G of solute/G of solution ) x 100

or 5 g in 100 g of solution

if 100 g of solution had 5 g of citric acid

325 g of solution would have (5X325/100) 16.25 g of citric acid

Mass of water = 325-16.25=308.75g

Moles of Citric acid = given weight/molar mass =16.25g/192.124 = 0.084 moles

temperature Density °C kg/m3 1 999.89 2 999.94 3 999.98 4 1000 5 1000 6 999.99 7 999.96 8 999.91 9 999.85 10 999.77 11 999.68 12 999.58 13 999.46 14 999.33 15 999.19 16 999.03 17 998.86 18 998.68 19 998.49 20 998.29 21 998.08 22 997.86 23 997.62 24 997.38 25 997.13 26 996.86 27 996.59 28 996.31 29 996.02 30 995.71 31 995.41 32 995.09 33 994.76 34 994.43 35 994.08 36 993.73 37 993.37 38 993 39 992.63 40 992.25 41 991.86 42 991.46 43 991.05 44 990.64 45 990.22 46 989.8 47 989.36 48 988.92 49 988.47 50 988.02 51 987.56 52 987.09 53 986.62 54 986.14 55 985.65 56 985.16 57 984.66 58 984.16 59 983.64 60 983.13 61 982.6 62 982.07 63 981.54 64 981 65 980.45 66 979.9 67 979.34 68 978.78 69 978.21 70 977.63 71 977.05 72 976.47 73 975.88 74 975.28 75 974.68 76 974.08 77 973.46 78 972.85 79 972.23 80 971.6 81 970.97 82 970.33 83 969.69 84 969.04 85 968.39 86 967.73 87 967.07 88 966.41 89 965.74 90 965.06 91 964.38 92 963.7 93 963.01 94 962.31 95 961.62 96 960.91 97 960.2 98 959.49 99 958.78 100 958.05

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