Q1:Consider the reaction xM + yN products: This reaction was run 10 times with d
ID: 899941 • Letter: Q
Question
Q1:Consider the reaction xM + yN products:
This reaction was run 10 times with different volumes of the two reactant solutions and the absorbance was measured. The two solutions are both 1.0 M and the total volume mixed together for all 10 reactions was the same. The reaction trial that had the largest absorbance was the one when 23.8 mL of M were mixed with 6.0 mL of N. What is the value of the coefficient x in the balanced equation? Your answer MUST be entered as an integer.
Q2: In a titration experiment, 9.3 mL of an aqueous HCl solution was titrated with 0.4 M NaOH solution. The equivalence point in the titration was reached when 9.5 mL of the NaOH solution was added. What is the molarity of the HCl solution?
Explanation / Answer
coefficient of X in the balanced equation = 4
NaOH: M1 = 0.4, V1 = 9.5 mL
HCl: M2 = ? , V2 = 9.3 mL
M1V1 = M2V2
M2 = M1V1/V2
= 0.4 X 9.5 / 9.3
= 0.4086 M
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