Confusing as hell Gen Chem Problem

[wired202808]

Advertisement - Members don't see this ad

50 mL of H2SO4 requires 50 mL of 1M NaOH, for complete neutralization reaction, what is the molarity of the acid; using the following formula:

2 NaOH + H2SO4 -> Na2SO4 + 2H2O

The answer is 0.5, which I dont quite get. Am i supposed to do this based on the NMV = NMV formula? If so then the answer would be 2, meanwhile if I use the equation above I get 1M, I don't get why they get 0.5. Did they somehow combine this as a limiting reagent problem?

 

[rockclock]

50 mL of H2SO4 requires 50 mL of 1M NaOH, for complete neutralization reaction, what is the molarity of the acid; using the following formula:

2 NaOH + H2SO4 -> Na2SO4 + 2H2O

The answer is 0.5, which I dont quite get. Am i supposed to do this based on the NMV = NMV formula? If so then the answer would be 2, meanwhile if I use the equation above I get 1M, I don't get why they get 0.5. Did they somehow combine this as a limiting reagent problem?

(Na)(Ma)(Va) = (Nb)(Mb)(Vb)
(2)(Ma)(50 mL) = (1)(1 M)(50 mL)
Ma = 0.5 M

 

[wired202808]

(Na)(Ma)(Va) = (Nb)(Mb)(Vb)
(2)(Ma)(50 mL) = (1)(1 M)(50 mL)
Ma = 0.5 M

I am retarted and do not know how to divide! jesus I was doing this backwards hahahah thanks rock lol damn it! thats when you know you've been studying all day and your brain is fried!

 

[Bis-GMA111]

1 M=x/.05 L -------> .05 moles of NaOH

2 moles so .05/2=.025 moles H2SO4

.025 mol/ .05 L= .5 M H2SO4

 

[rockclock]

I am retarted and do not know how to divide! jesus I was doing this backwards hahahah thanks rock lol damn it! thats when you know you've been studying all day and your brain is fried!

no problem. the way your OP read, I could tell you were just torched at the end of a long day.

 

[Bereno]

I am retarted and do not know how to divide! jesus I was doing this backwards hahahah thanks rock lol damn it! thats when you know you've been studying all day and your brain is fried!

lol, I respect your devotion to studying buddy! I hope your 2009 test went well!