40. A solution is made by taking 2.42 grams of NaCl, 6.44 grams of NaC104, 3.81 grams of KNO3, and 4.64 grams of KBr in enough water to make 500 mL of solution. A portion was treated with thymol blue indicator, for which the pKnd =8.8, and the colors are yellow for Hind, and blue for Ind. What color should be obtained with the test portion? A) blue B) green C) yellow D) orange E) red 41. For H;PO3, which is actually a diprotic acid, Kal =1.0 x 10 and K =2.6 x 10. Calculate a value for the [HPO,1 in a 0.500 molar solution of H;PO, A) 2.6 x 10 mol/L D) 8.5 x 10° mol/L B) 6.6 x 10 mol/L E) 3.3 x 10 mol/L C) 7.1 x 10 mol/L 42. The pH at the equivalence point of the titration of acetic acid solution by sodium hydroxide solution is A)<2 00 B) 3.50 < pH < 7.00 C) 7.00 D) 7.00 < pH < 11.00 E) > 11.0
40. A solution is made by taking 2.42 grams of NaCl, 6.44 grams of NaC104, 3.81 grams of KNO3, and 4.64 grams of KBr in enough water to make 500 mL of solution. A portion was treated with thymol blue indicator, for which the pKnd =8.8, and the colors are yellow for Hind, and blue for Ind. What color should be obtained with the test portion? A) blue B) green C) yellow D) orange E) red 41. For H;PO3, which is actually a diprotic acid, Kal =1.0 x 10 and K =2.6 x 10. Calculate a value for the [HPO,1 in a 0.500 molar solution of H;PO, A) 2.6 x 10 mol/L D) 8.5 x 10° mol/L B) 6.6 x 10 mol/L E) 3.3 x 10 mol/L C) 7.1 x 10 mol/L 42. The pH at the equivalence point of the titration of acetic acid solution by sodium hydroxide solution is A)<2 00 B) 3.50 < pH < 7.00 C) 7.00 D) 7.00 < pH < 11.00 E) > 11.0
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:40. A solution is made by taking 2.42 grams of NaCl, 6.44 grams of NaCi04, 3.81 grams of
KNO3, and 4.64 grams of KBr in enough water to make 500 mL of solution A portion was
treated with thymol blue indicator, for which the pKind =8.8, and the colors are yellow for
Hind, and blue for Ind What color should be obtained with the test portion?
A) blue
B) green
C) yellow
D) orange
E) red
41. For HjPOs, which is actually a diprotic acid, Kai =1.0 x 10 and K, =2.6 x 10 Calculate
a value for the [HPO,1 in a 0.500 molar solution of H,PO,.
A) 2.6 x 10 mo/L
D) 8.5 x 10° mol/L
B) 6.6 x 10 mol/L
E) 3.3 x 10 mol/L
C) 7.1 x 10 mol/L
42. The pH at the equivalence point of the titration of acetic acid solution by sodium hydroxide
solution is
A) <2 00
B) 3.50 < pH < 7.00
C) 7.00
D) 7.00 < pH < 11.00
E) > 11.0
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