The concentration (M) of hydrogen fluoride is mathematically given as
HF= 0.095 M
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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