calculate and record the expected mass of benzoic acid (C7H6O2) (MW = 122.12) required to react in stoichiometric proportion with 20 mL of a 0.1 M sodium hydroxide solution. Record the required mass of benzoic acid in your Lab Notes.

Question

calculate and record the expected mass of benzoic acid (C7H6O2) (MW = 122.12) required to react in stoichiometric proportion with 20 mL of a 0.1 M sodium hydroxide  solution. Record the required mass of benzoic acid in your Lab Notes.

greatlife44 · Answer

I suggest writing out the balanced equation first

greatlife44 · Answer

this is to show you what's happening here 

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greatlife44 · Answer

MaVa = MbVb

Ma = sodium hydroxide 
Mb = benzoic acid

greatlife44 · Answer

We have 20 ml right?

And from the reaction above, we can see that this is a 1:1 molar ratio. So this makes our work easier.

Molarity = moles per liter m/L

But they gave us a hint from the equation above we can find the number of moles we need by multiplying m/L *L to get moles. 20/1000 = .02L * 0.1mol/L = .002 moles of benzoic acid are needed. As I said before this reaction is 1:1 so it makes our lives easier.

Questions?