dat achiever....gchem question

[future_dentist]

How many milliliters of 3.0 M H2SO4 are required to neutralize 30.0 ml of 4.0 M NaOH?

A. 15
B. 20
C. 25
D. 30
E. 40

Explanation:

Correct Answer: B

Without the need to express a full chemical equation, it is obvious that only 0.5 mole of H2SO4 is required to neutralize every mole of NaOH.

Using simple proportional relation, amount of H2SO4 required will therefore be:

HOW IS IT OBVIOUS THAT ONLY 0.5 MOLE OF H2SO4 IS REQUIRED TO NEUTRALIZE EVERY MOLE OF NaOH????????

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[Clover]

well, just plug it into your N1V1=N2V2 forumla - that gets you 20ml

however, what they mean is that there are 2 Hs in H2SO4 to pair with 1 OH from NaOH, therefore there is 0.5 (half) mole NaOH for every 1 mole H2SO4