1. Accounting for the change in concentration due to dilution is a critical aspe
ID: 943242 • Letter: 1
Question
1. Accounting for the change in concentration due to dilution is a critical aspect of this experiment. Calculate the concentration of the I- ions in a solution if 6.0 mL of 0.30 M KI is added to 4.0 mL of 0.45 M NaI and 2.0 mL of water.
2. A student performing this experiment ended up with an equation of y = -5694x+ 15.32. Using this information and the Rate Law above determine the time it would take for a mixture of 20.0mL of 0.10M H2O2 , 20.0mL of 0.20M KI , 10.0 mL of Buffer, 10.0mL of 0.020M Na2S2O3 with 40.0 mL DI water. How many seconds would it take for the color to change at if the reaction is run at a temperature of 10.0C. Report your answer in seconds
Explanation / Answer
Since NaI and KI are are salts , therefore they completely dissociate into its respective ions
Thus, moles of I- = moles of NaI = molarity*volume of solution in litres = 0.45*0.002 = 9*10-4
moles of I- = moles of KI = molarity*volume of solution in litres = 0.3*0.006 = 1.8*10-3
Total moles of I- = 9.18*10-4
Total volume of solution = 8 ml = 0.008 litres
Thus, total [I-] = 9.18*10-4/0.008 = 0.115 M
2) What exactly does the equation implies, please explain.
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