Homework Answers
5)
Molar mass of KC8H5O4,
MM = 1*MM(K) + 8*MM(C) + 5*MM(H) + 4*MM(O)
= 1*39.1 + 8*12.01 + 5*1.008 + 4*16.0
= 204.22 g/mol
mass(KC8H5O4)= 0.187 g
use:
number of mol of KC8H5O4,
n = mass of KC8H5O4/molar mass of KC8H5O4
=(0.187 g)/(2.042*10^2 g/mol)
= 9.157*10^-4 mol
volume , V = 1.25*10^2 mL
= 0.125 L
use:
Molarity,
M = number of mol / volume in L
= 9.157*10^-4/0.125
= 7.325*10^-3 M
Answer: 7.32*10^-3 M
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Question 5 Status: Tries remaining: 3 Points possible: 1.00 Calculate the molarity of a solution prepared...
Question 6 Status: Tres remaining 3 1 Points possible: 1.00 A beaker containing 0.400 g KHP...
Question 6 Status: Tres remaining 3 1 Points possible: 1.00 A beaker containing 0.400 g KHP was titrated with NaOH solution. The pale pink end point was reached after 18.55 mL of NAOH solution was dispensed. What is the molarity of the NaOH solution? Answer: CHECK
Question 6 Status: Tries remaining: 3 Points possible: 1.00 A beaker containing 0.400 g KHP was...
Question 6 Status: Tries remaining: 3 Points possible: 1.00 A beaker containing 0.400 g KHP was titrated with NaOH solution. The pale pink end point was reached after 19.55 mL of NaOH solution was dispensed. What is the molarity of the NaOH solution? Answer:
Question 5 Status: Tries remaining: 3 | Points possible: 1.00 Calculate the molarity of a solution...
Question 5 Status: Tries remaining: 3 | Points possible: 1.00 Calculate the molarity of a solution prepared by dissolving 0.185 g of KHP in enough water to make 125 mL of solution. The formula of KHP is KC3H304. Answer:
formula for KHP is KC8H5O4 A beaker containing 0.400 g KHP was titrated with NaOH solution....
formula for KHP is KC8H5O4
A beaker containing 0.400 g KHP was titrated with NaOH solution. The pale pink end point was reached after 16.45 mL of NaOH solution was dispensed. What is the molarity of the NaOH solution? Answer: CHECK
Question 6 Status: Tries remaining: 3 | Points possible: 1.00 Suppose in an experiment to determine...
Question 6 Status: Tries remaining: 3 | Points possible: 1.00 Suppose in an experiment to determine the amount of sodium hypochlorite in bleach, 0.0000460 mol KIO3 were titrated with an unknown solution of Na S,0a and the endpoint was reached after 17.80 mL. How many moles of Na,S203 did this require? Answer: CHECK Question 8 Status: Tries remaining: 3 | Points possible: 1.00 A 25.00 mL solution containing 0.035 M sodium acetate is titrated witha 0.098 M solution of HCl....
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Status: Tries remaining: 2 Points possible: 1.00 If the density of aluminum is 2.70 g/mL and there are 453.9 grams in a pound, what is the volume (in ml) of an aluminum bar that weighs 13.0 lbs? Answer: CHECK
Question 1 Status: Tries remaining: 2 | Points possible: 1.00 The reaction is a type of Choose.. that Saponifica...
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Question 7 Status: Tries remaining: 31 Points possible: 1.00 What is the net ionic equation for the reaction between KC,H,O, and NaOH? Select one: O C:H:0,- (aq) + K+ (aq) +Na+ (aq) + OH(aq) + (aq) + Na+ (aq) + CH,0,(aq) + H2O(1) C,H,O, (aq) + OH (aq) +CH,0,?- (aq) + H2O(1) O O CHOK (aq) + NaOH (aq) + K+ (aq) +Na* (aq) + C4H10 (aq) + HO (1) O C,H,O, K (aq) + NaOH(aq) — KNaC,H,O,? (aq) +...
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a...
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette. cm what is The absorbance of the solution at 427 nm is 0.46. If the molar absorptivity of yellow dye at 427 nm is 27400 M the concentration of the solution? Answer: Question 9 Status: Tries remaining: 2 Points possible: 1.00 If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope...
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which are soaps and which are not soaps?
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Question 6 Status: Tres remaining 3 1 Points possible: 1.00 A beaker containing 0.400 g KHP was titrated with NaOH solution. The pale pink end point was reached after 18.55 mL of NAOH solution was dispensed. What is the molarity of the NaOH solution? Answer: CHECK
Question 6 Status: Tries remaining: 3 Points possible: 1.00 A beaker containing 0.400 g KHP was titrated with NaOH solution. The pale pink end point was reached after 19.55 mL of NaOH solution was dispensed. What is the molarity of the NaOH solution? Answer:
Question 5 Status: Tries remaining: 3 | Points possible: 1.00 Calculate the molarity of a solution prepared by dissolving 0.185 g of KHP in enough water to make 125 mL of solution. The formula of KHP is KC3H304. Answer:
formula for KHP is KC8H5O4
A beaker containing 0.400 g KHP was titrated with NaOH solution. The pale pink end point was reached after 16.45 mL of NaOH solution was dispensed. What is the molarity of the NaOH solution? Answer: CHECK
Question 6 Status: Tries remaining: 3 | Points possible: 1.00 Suppose in an experiment to determine the amount of sodium hypochlorite in bleach, 0.0000460 mol KIO3 were titrated with an unknown solution of Na S,0a and the endpoint was reached after 17.80 mL. How many moles of Na,S203 did this require? Answer: CHECK Question 8 Status: Tries remaining: 3 | Points possible: 1.00 A 25.00 mL solution containing 0.035 M sodium acetate is titrated witha 0.098 M solution of HCl....
Status: Tries remaining: 2 Points possible: 1.00 If the density of aluminum is 2.70 g/mL and there are 453.9 grams in a pound, what is the volume (in ml) of an aluminum bar that weighs 13.0 lbs? Answer: CHECK
Question 1 Status: Tries remaining: 2 | Points possible: 1.00 The reaction is a type of Choose.. that Saponification is the process of making soap from fats or oils Choose... which is the soap uses the addition of a to release the Choose... CHECK Question 1 Status: Tries remaining: 21 Points possible: 1.00 . The reaction is a type of Choose... condensation that fats or oils Saponification is the process of making soap from ,which ist esterification hydrolysis to release...
Question 7 Status: Tries remaining: 31 Points possible: 1.00 What is the net ionic equation for the reaction between KC,H,O, and NaOH? Select one: O C:H:0,- (aq) + K+ (aq) +Na+ (aq) + OH(aq) + (aq) + Na+ (aq) + CH,0,(aq) + H2O(1) C,H,O, (aq) + OH (aq) +CH,0,?- (aq) + H2O(1) O O CHOK (aq) + NaOH (aq) + K+ (aq) +Na* (aq) + C4H10 (aq) + HO (1) O C,H,O, K (aq) + NaOH(aq) — KNaC,H,O,? (aq) +...
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette. cm what is The absorbance of the solution at 427 nm is 0.46. If the molar absorptivity of yellow dye at 427 nm is 27400 M the concentration of the solution? Answer: Question 9 Status: Tries remaining: 2 Points possible: 1.00 If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope...
which are soaps and which are not soaps?
Status: Tries remaining: 2 Points possible: 1.00 The cleaning ability of soap is based on its structure. Which structures represent compounds that can be used as soaps? m ✓ Choose... Not a soap Soap Choose.. Choose... Choose... Choose.. CHECK
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