Question

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Exercise 5. How many mL of 1.20M HCl would it take to just exhaust 100.mL of a buffer that is 0.300M in HCO3 and 0.200M in CO32-? a) Writoala balanced net ionic reaction that occurs when the HCl is added. b) What are the initial mmoles of CO2-before reaction? c) How many mmoles of HCl will be required to neutralize the buffer. d) How many mL of the HCl solution will be required?

Answer 1

a)

The balanced reaction is,

CO₃^-2 + H ⁺ --->  HCO₃-

b)

Let us calculate millimoles of CO₃^2- is

mmol = M * V

= 0.2 M * 0.1 L * 1000

= 20 mmol

c)

The same moles of CO3-2 as those of HCl, 20 mmol are required.

d)

The volume of HCl =  mmol / M

= 20 mmol / 1.2 M

= 17 mL