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anonymous
 one year ago
What volume of 1.2M H2SO4 is required to react exactly with 3.5g of NaOH (MW=40.0g/mol) according to the following reaction?
2NaOH+H2SO4> NaSO4+2H2O
anonymous
 one year ago
What volume of 1.2M H2SO4 is required to react exactly with 3.5g of NaOH (MW=40.0g/mol) according to the following reaction? 2NaOH+H2SO4> NaSO4+2H2O

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I am guessing it's another M1V1=M2V2 equation.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1nope, this is a stoichiometry problem not a dilution (you're reacting a base and an acid) have you done these before?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the better questions is did I understand them to begin with and have I asked my teacher? question one no and question two yes (wasn't much help since he quoted the book which I didn't understand in the first place)

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1okay, do you want me tell you how, or you're okay with it?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0please explain away.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1lol alright. I have this written out from before. General Scheme: \(\sf \large 1.\)First write and balance an equation for the process described. So you have the chemical equation balanced (this is crucial because you need the stoichiometric coefficients). \(\sf \large 2.\)Next, use the stoichiometric coefficients to find moles produced. \(\sf \large 3.\) Set up a ratio using the species of interest, like so: e.g. for a general reaction: \(\sf \large \color{red}{a}A + \color{blue}{b}B \rightleftharpoons \color{green}{c}C\) where upper case are the species (A,B,C), and lower case (a,b,c) are the coefficients , \(\sf \dfrac{n_A}{\color{red}{a}}=\dfrac{n_B}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}\) From here you can isolate what you need. For example: if you have 2 moles of B, how many moles of C can you produce? solve algebraically: \(\sf\dfrac{2}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}\rightarrow n_C=\dfrac{2*\color{green}{c}}{\color{blue}{b}}\) \(\sf \large 4.\) Solve  you need to work with moles in stoichiometric problems, so convert the mass 3.5 g to moles of NaOH. \(\sf moles=\dfrac{mass}{Molar~mass}\)  once you found moles of sulfuric acid, convert to volume using: \(\sf molarity=\dfrac{moles}{Liters }\)

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1lol it's much simpler than it looks. finding moles of NaOH moles of NaOH \(=\dfrac{3.5~g}{39.997 g/mol} = 0.08750~moles \) Using stoichiometric coefficients in ratio with moles \(\sf \dfrac{0.08750~moles }{1}=\dfrac{moles~ of~ H_2SO_4}{2}\) \(\sf moles~ of~ H_2SO_4=2*\dfrac{0.08750~moles }{1}=0.1750~ moles\) Finding volume of sulfuric acid \(\sf L=\dfrac{0.1750~ moles}{1.2~M}=0.1458~L=145.8~mL\approx 146 mL\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Were did you pull the 2 from?

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1the 2 is from the coefficients,...oh crap, i messed it. it should be \(\sf \dfrac{0.08750~moles }{2}=\dfrac{moles~ of~ H_2SO_4}{1}\)

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1so then \(\sf moles~ of~ H_2SO_4=1*\dfrac{0.08750~moles }{2}=0.04375~ moles\)

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1and \(\sf L=\dfrac{0.04375~ moles}{1.2~M}=0.03645~L=36.5~mL\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0This is going to be just a rhetorical question but really what kind of stupid insanity is behind all that. It's like getting a math problem you won't even use in real life.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1this is a very general problem, it'll come across in real life if you do any kind of work with wet chemistry

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0None because I am a friggen Mechanic.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1yeah, then i guess it wont.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok looks like I got another problem that looks like this one. Zinc dissolves in hydro chloric acid to yield to hydrogen gas: Zn(s)+2HCl(aq)> ZnCl2(aq)+H2(g). When a 12.7g sample of zinc dissolves in 5.00*10^2ml of 1.450M HCL. What is the concentration of chloride ion in the final solution?

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1sort of, but you just have find the molarity of ZnCl2 in the solution, then multiply that by 2 (because there are two Cl^ ions for every Zn^(2+) ion \(\sf ZnCl_2\rightarrow Zn^{2+}+2Cl^\) moles of MgCl2= 12.7g/95.211 g/mol=0.1333 moles \(molarity~of~MgCl_2=\dfrac{0.1333~moles}{0.5~L}=0.2667~M\) \([Cl^]=2*[MgCl_2]=2*0.2667~=0.534~M\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0doesn't equal any of the possible answers. Possible Answers .674 mole .776 mole 1.06 moles 1.45 moles

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1sorry, i keep reading the questions, wrong. you used HCl not ZnCl2, so the concentration of \(Cl^\) is same as that of HCl, because they are 1:1 in number of atoms.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1\(HCl\rightarrow H^++Cl^\) so [Cl^] =1.450 M

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I friggen hate chemistry. Thank you again.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1it gets much more interesting once you get past this basic general chemistry stuff. no problem

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@aarong I just retook the quiz I was taking and looked for that 1.45M answer and it wasn't there. The remaining answers that where there that was in the previous questions where .674M, .776M, and 1.06M. The answer turned out to be .674M. Care to explain?

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1Are you sure it was the exact same question? the answer \(is\) 1.45 M

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1The volume didn't change, so the molarity wouldn't have changed.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Dude i checked three times before answering.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1that's really strange because that is the answer, hold on let me try to google the question

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1I can't find anything. sorry dude. I know the concentration of chloride ion would be the same because both HCl or ZnCl2 are very soluble in water, so they wouldn't precipitate out of solution thus remain unchanged throughout the reaction.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It is what it is. Frankly I think these quizzes are messed up beyond belief.
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