e reaction of the strong acid HCI with the weak base CH3NH2 is: HCI(aq) + CH3 NH
ID: 228225 • Letter: E
Question
e reaction of the strong acid HCI with the weak base CH3NH2 is: HCI(aq) + CH3 NH,(aq) CH3 NH;(aq) + Cl-(aq) To compute the pH of the resulting solution if 18mL of 0.35M acid is mixed with 58mL of 0.65M base we need to start with the stoichiometry. Let's do the stoich in steps: Number Number How many moles of acid? 0.0063 How many moles of base? 0.0377 What is the limiting reactant? HCL Number How many moles of the excess reagent after reaction?0.031-4 Number 0.413 Number 0.083 What is the concentration of the excess reagent after reaction? What are the moles of the pH active product after reaction? (remember the spectator ion is not pH active) Incorrect.Explanation / Answer
HCl (aq) + CH3NH2 (aq) --------------> CH3NH3+ (aq) + Cl- (aq)
1 1 1
0.0063 0.0377
here limiting reagent os HCl .
product is based on limiting reagent.
1 mol HCl ----------------> 1 mol CH3NH3+
0.0063 mol HCl -------------> ??
moles of CH3NH3+ = 0.0063 mol
moles of pH active product = 0.0063 mol
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