How to Prepare an HCl Solution with pH 4.2 from pH 2.9?

AI Thread Summary
To prepare an HCl solution with a pH of 4.2 from a pH of 2.9, dilution is required. The initial concentration of hydronium ions (H3O+) is calculated to be 1.258×10^-3 mol/L, while the target concentration is 6.309×10^-5 mol/L. The procedure involves determining the appropriate dilution ratio of the original acid solution with water. This ensures the final solution achieves the desired pH level. Proper calculations are essential for accurate dilution.
Jeanclaud
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Homework Statement


Knowing that HCl is strong acid we want to prepare HCl solution of pH=4.2.starting from a solution of pH=2.9.Explain briefly the procedure that should be followed to do this operation.

Homework Equations


pH=-log(H3O+)
3. The Attempt at a Solution [/B]
I calculated: At beginningC(H3O+)=1.258×10^-3mol/L
at end C(H3O+)= 6.309×10^-5mol/L
and please I want to know is the procedure dillution?
 
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Yes, it is dilution. You need to find out in what ratio to mix your original acid with water.
 
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