SELECT * FROM question_mgmt as q WHERE id=3075 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=48 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10–3 M. what is its pH?

Answer:

Given that:

[H+]  =  3.8 × 10–3

∴ pH value of soft drink

= -log [H+] 

=  -log [3.8 × 10–3] 

= -log [3.8]  - log[10–3]

= -log [3.8]  +  3

= -0.58 + 3

=  2.42


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