Qualification > Sciences
CHEMISTRY PAPER 1 HERE
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--- Quote from: mizuki on June 11, 2009, 12:14:51 pm ---hey guys id appreciate some help.may june 03 q21
water is added to dilute H2SO4 of pH4.What is the resulting pH?
the answer is 6,but why?i know it has something to do with the hydroxide or hydrogen ions in water which change its pH....
--- End quote ---
Water has a pH of 7, so when it is added to a pH4 substance, it will try to bring the pH of the substance to 7. Since 8 is above 7, it is wrong. The pH can't remain same, and neither can it become further acidic, so it has to be the one that is close to 7, or slightly less than it. That is 6.
girl_92:
--- Quote from: mizuki on June 11, 2009, 12:14:51 pm ---hey guys id appreciate some help.may june 03 q21
water is added to dilute H2SO4 of pH4.What is the resulting pH?
the answer is 6,but why?i know it has something to do with the hydroxide or hydrogen ions in water which change its pH....
--- End quote ---
its jus tht it bcums dilute so the pH lowers i think so
MR.BooMBastiC:
--- Quote from: mizuki on June 11, 2009, 12:14:51 pm ---hey guys id appreciate some help.may june 03 q21
water is added to dilute H2SO4 of pH4.What is the resulting pH?
the answer is 6,but why?i know it has something to do with the hydroxide or hydrogen ions in water which change its pH....
--- End quote ---
it has nothing to do with hydroxide..
when u add water it becomes diluted so its ph increases...
hope u got it now... :)
sweetest angel:
--- Quote from: mizuki on June 11, 2009, 12:14:51 pm ---hey guys id appreciate some help.may june 03 q21
water is added to dilute H2SO4 of pH4.What is the resulting pH?
the answer is 6,but why?i know it has something to do with the hydroxide or hydrogen ions in water which change its pH....
--- End quote ---
LOW PH+high PH=neutral
high ph+ high ph= alkaline
low ph+ low ph= acidic
in this case a low ph and a neutral would give u weak acidic only
further xplanation of the results of neutralisation i think is nt needed!
NOW I GOT A QUESTION: NOV08 Q13: y is it B not A?????
esso:
i need help in this question <
Three reactions used in the manufacture of sulphuric acid are shown.
1 S + O2 ? SO2
2 2SO2 + O2 ? 2SO3
3 SO3 + H2O ? H2SO4
Which of these reactions are redox reactions?
A 1 only
B 3 only
C 1 and 2 only
D 2 and 3 only
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