QUES: Calculate the Ph of a 10^-5M HCl solution if 1ml of it is diluted to 1000ml , K_w= 1× 10^-14.

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Solution

moles =Molarity volume in liters
=10^-5mol/L0.001L
=1.010^-8moles

please note M stands formolarity and its unit is mol/L

M of final solution =moles/volume in L

=1.010^-8moles/1L
HCl(aq)===>H+(aq) +Cl-(aq)

molarity of HCl and H+ are same since mole ratio is 1:1

pH=-log[H+]
pH=-log(1.0*10^-8)
=-(-8)
=8

you can also find the conc of final solution usign dilution formula
M1V1=M2V2

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