<p>^Knew I forgot something. Yeah, it should be F, it didn’t account for water vapor.</p>
<p>well, if you know the pressure of the gas, you can just subtract the pressure of the water vapor to find the pressure of the gas collected - that’s standard procedure in gas-collecting experiments</p>
<p>I believe it said that the gas you were measuring is equal to the atmospheric pressure.</p>
<p>But if it was the “total gas inside” then it would be true…</p>
<p>Anyone remember the wording?</p>
<p>true but the second statment didn’t account it just said that outside pressure equals pressure of gas</p>
<p>If it equals the pressure of the gas it could have meant the total amount of gas inside the inverted tube?</p>
<p>Blah, that’s confusing wording :(</p>
<p>I think it was worded the outside pressure equals the total pressure inside the tube. I remember the word total being in there and thinking that it included vapor pressure.</p>
<p>Luminouzz im pretty sure its just talking about the gas that is collected because wvp isn’t supposed to count as part of the gas’</p>
<p>^lol two contradictory responses.</p>
<p>sylvie, are you sure the word total was in there? I don’t remember it =[</p>
<p>half life question was 3 half lifes?</p>
<p>So that eduiometer TTCE question branches off into two separate theories:</p>
<p>1: It said that the inside total pressure is the same as the outside pressure when the water level is the same. In this case, the answer to the second portion would have been T, making the entire answer TTCE.</p>
<p>2: It said that the inside gas pressure is the same as the outside pressure when the water level is the same. In this case, the answer to the second portion would have been F, making the entire answer TF.</p>
<p>I really hope it’s the first option :X.</p>
<p>I’m really sure it said total because I remember thinking “Does vapor pressure count or not?” So I reread the question and it said total so I put TTCE.</p>
<p>Oh, phew, that’s a relief then. Sorry about that hydroxideion =(.</p>
<p>damn… if its true -4…</p>
<p>This thread is so depressing. I left the test feeling as though I had nailed it.</p>
<p>Well, at least we can expect a good curve, right?</p>
<p>-4 will still get you an 800 hydroxide </p>
<p>And yeah, hopefully we get a nice curve…it’s specific to each test right?</p>
<p>I’d be pretty annoyed if they slapped a curve from a different test onto this one.</p>
<p>Edit: Confirming two more questions
Half life question was 3 half lifes
NH4NO3 + NH3 shifts pH in the same direction as when KOH is added.</p>
<p>No, the curve is specific to each test.</p>
<p>The test in the Blue Book is significantly easier than today’s was. The curve will definitely be nicer.</p>
<p>“NH4NO3 + NH3 shifts pH in the same direction as when KOH is added.”</p>
<p>is that answer right? i put HCl because weren’t there Cl- ions on the product side? i don’t remember the reaction properly is why im not sure…but i thought because there was a Cl- ion on the product side and common ion effect…idk. might be wrong</p>
<p>hcl is what i put and it was three half lifes or 45 days</p>
<p>actually, NH4+ –> NH3 + H+. So when you add NH3, it shifts to the left, and the concentration of H+ goes down. pH goes up (becomes more basic) - therefore, KOH is correct.</p>
<p>the common ion effect does not apply to Cl- because HCl is a strong acid and dissociates completely.</p>
<p>Wait, for that one if it’s NH4+ –> NH3 + H+ and you want to shift it to the left, HCl would be the right answer because HCl does dissociate and thus adds H+ ions, shifting it also to the left.</p>
<p>:( sylviecerise, you overthought it 
Adding HCl will always make it more acidic. It’s HCl, that’s what it does.</p>