one gchem question from achiever

[Keroro]

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How many milliliters of 0.05 M HCl are required to turn 20 ml of 0.05 M KOH into a solution of pH 2.00?



A. 10
B. 15
C. 20
D. 25
E. 30

 

[marylanddds]

How many milliliters of 0.05 M HCl are required to turn 20 ml of 0.05 M KOH into a solution of pH 2.00?



A. 10
B. 15
C. 20
D. 25
E. 30

its a 2 step process. the answer is explained on acheiver. first neutralize, then make ph = 2

 

[Keroro]

(0.05M HCl ) x (x ml) = (0.01M HCl) x (40+x)


x = 10 ?

 

[tom_servo_dds]

How many milliliters of 0.05 M HCl are required to turn 20 ml of 0.05 M KOH into a solution of pH 2.00?



A. 10
B. 15
C. 20
D. 25
E. 30

http://forums.studentdoctor.net/showthread.php?p=4003309

 

[tom_servo_dds]

(0.05M HCl ) x (x ml) = (0.01M HCl) x (40+x)


x = 10 ?

10 + the 20 that you added to neutralize = 30.