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A buffer solution contains 0.100 M fluoride ions and 0.126 M hydrogen fluoride. Calculate the concentration (M) of hydrogen fluoride, to 3 significant figures, after addition of 9.00 mL of 0.0100 M HCl to 25.0 mL of this buffer solution

Respuesta :

The concentration (M) of hydrogen fluoride is mathematically given as

HF= 0.095 M

What is the concentration (M) of hydrogen fluoride?

Question Parameters:

A buffer solution contains 0.100 M fluoride ions and 0.126 M hydrogen fluoride.

after addition of 9.00 mL of 0.0100 M HCl to 25.0 mL of this buffer solution

Generally, the equation for the Chemical Reaction  is mathematically given as

F- + H+ > HF

Where

Initial moles of HF = molarity * volume

mi= 0.126 × 25

mi= 3.15

Hence

moles of F- = 2.5 milimoles

moles of H+ added  = 0.09mol

In conclusion

Total volume of Hf = 9 + 25

Total volume of Hf = 34 ml

Where

moles of HF after reaction

mr= 0.09 + 3.15

mr= 3.24

Hence

HF = 3.24 /34

HF= 0.0953 M

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