<p>Don't you have to know the concentration of the HCl to do that problem or is it just assumed to be 1M?</p>
<p>At standard conditions it is 1 M, but they usually would say 1 M anyway.</p>
<p>The answers are in moles so you don't need concentration.</p>
<p>Umm, yes you do. If it says 0.01L of HCL, then you'd be like what? You can't find the number of moles without the volume and molarity.</p>
<p>Umm no you don't need molarity... you know how many number of moles you need to neutralize 0.01 moles of Ca(OH)2, which is 0.02 moles, and the answers are in moles. If they asked you for the volume then you'd need concetration, but the answers are already in moles.</p>
<p>Oh, sorry again. I meant M for Ca(OH)2.</p>
<p>Haha I see :] Better read carefully on the actual test!</p>
<p>Suddenly, everything makes sense. (About what you said, I mean, I<3Pi.)</p>
<p>if it were NaOH instead of Ca(OH)2, the answer would be .01, correct?</p>
<p>yup .</p>
<p>Correct :]</p>
<p>Good Luck Everyone!</p>
<p>Does anyone have a chart of polyatomic ions...well..the most common ones. I can never remember their charges and can't find it in my books right now</p>
<p>(SO4)2-
(SO3)2-
(ClO4)-
(ClO3)-
(ClO2)-
(ClO)-
(C2H3O2)-
(BrO3)-
(IO3)-
(MnO4)-
(Cr2O7)2-
(CrO4)-
(HCO3)-
(CO3)2-
(NH4)+
(HPO4)2- (I'm not sure about charge on this one)
(PO4)3-
(S2O3)2- (I'm not sure about charge on this one)
(NO3)-
(NO2)-</p>
<p>I think that's most of em</p>
<p>For my question (see last page), yes I forgot to add 1M. That's important... sorry about that. The answer is C. I added that question cause I got a problem like that wrong on one of the practice tests. Don't forget about mole ratios (not everything's one to one)!</p>
<p>(HPO4)2- is correct</p>
<p>I'm not sure about (S2O3)2- though</p>
<p>thanks, and good luck to you all</p>