SOLVE ALL 5 questions. 1. If 20.00 mL of 0.2019 M HCI requires 39.63 mL of a NaO

Question

SOLVE ALL 5 questions.

1. If 20.00 mL of 0.2019 M HCI requires 39.63 mL of a NaOH solution for complete neutralization, what is n the answer? 2. How many milliliters of 14.5 M NH, are needed to prepare 6.5 liters of 0.40 MNHy? 3. Write the net ionic equation for the unknown titration reaction in this experiment. When setting up their experiment, a student discovered that the solution in their flask turned bright pink upon adding 2 drops of the indicator, even before beginning the titration. What do you suspect was the mistake that the student made? 4. When dissolving a solid acidic sample with water, does it matter how much water we use to dissolve it? (Hint: will it change our calculations of our titration?) 5. 61

Explanation / Answer

Q1

the reaction

HCl(aq) + NaOH(aq) = H2O(l) + NaCl(aq)

so ratio is 1:1

calculate moles of acid

mol = MV = 20*.2019 = 4.038 mmol of HCl

so 1=1 ratio implies 4.038 mmol of NaOH as well

so

M = mmol/mL for NaOH:

M = 4.038/39.63

M = 0.101892 M of NaOH

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