<p>HCl cannot hydrolyse because it’s a strong acid. Though you were correct in thinking that the equilibrium would shift to hydrolyse ammoniac into ammonium, the added H+ ions from the HCl would remain. The pH would thus be lowered.</p>
<p>yea my thinking process was exactly of sylviecerise’s</p>
<p>Are you sure? Because NH3+ is such a weak acid I don’t think that’s right… if you add more of a product to an equilibrium the reverse rate will increase.</p>
<p>Wat was the answer to the question that was in Part A. Gave you a bunch of reactions, and the question asked which one evolved a gas.</p>
<p>Also, if you add KOH, a strong base, they would react with the H+, thus shifting the reaction right.</p>
<p>wooot! I am pretty sure its hcl also because when u right out the equation the common ion effect for cl- occurs (if i remember correctly)</p>
<p>We need to know the concentrations of the acids and bases in question. Otherwise, this isn’t going to go anywhere.</p>
<p>The one that evolved a gas was the one that produced H2CO3, an unstable substance that decomposes into H2O and CO2.</p>
<p>The common ion effect doesn’t come into play with strong acids or bases. HCl dissociates into Cl- and H+, which cannot recombine. If they did, the compound would merely dissociate once again.</p>
<p>Did it give concentrations? I thought it just gave the equation.</p>
<p>ok
I put KOH because NH3 is a base, so it would shift ph in the same direction
was the question asking for equilibrium shift or ph?</p>
<p>What was the question exactly? I’m having trouble remembering it…</p>
<p>What was the one with KCl -> K+ + Cl- Enthalpy was positive</p>
<p>The only reasonable answer I saw was that K+ and Cl- ions forming KCl in solution would be exothermic (since it’s simply the reaction reversed). But KCl is soluble so…</p>
<p>Edit: Rocker, the question was-</p>
<p>If you have NH4CL in solution and then add NH3, it changes the pH in the same way as which of the following:</p>
<p>its definetly KOH then</p>
<p>Edit: Mistyped. NH4CL. I don’t see how the common ion effect would apply here. Wouldn’t HCl as a strong acid just increase the pH?</p>
<p>So the reaction taking place is NH4 <–> NH3 + H+</p>
<p>Adding NH3 places a stress on the system, and thus lowers the hydrogen ion content because the reverse reaction is forced to take place. Thus, the pH is raised.</p>
<p>It has to be KOH.</p>
<p>Adding HCl would raise the hydrogen ion content, once again placing a stress on the system. In an effort to minimize this stress, ammonium would be created. One of two things will happen:</p>
<ol>
<li>Ammonium will be created until the equilibrium concentrations are attained again, and there will this be no change in pH.</li>
<li>If there is an extremely large amount of HCl added, there will be such a high concentration of hydrogen ions that all of the ammonia will recombine into ammonium and equilibrium still won’t be attained. The pH would thus still be lowered.</li>
</ol>
<p>Your edit changes everything. Hold on.</p>
<p>no the ruthorford was FF
alpha particles are the largest of particles and are deflected it repels the nuclues, nuetrons + protons makes the nuclues(MASS), the major component of the volume.</p>
<p>Experiment one was TTCE</p>
<p>there was one about ice bath or crystillazation</p>
<p>and something about 1 mole Co2 or 0.5 CO</p>
<p>NH4Cl would dissociate into Cl- and NH4, which would further dissociate into NH3 and H+. Adding NH3 would favor the reverse reaction, thus creating more NH4 and lowering the hydrogen ion concentration, and raising the pH.</p>
<p>Adding HCl to this solution would simply lower the pH. The chlorine ions cannot combine with hydrogen ions (they would immediately dissociate) or with ammonium ions (they, too, would immediately dissociate). The two outcomes I wrote in my previous post are still valid.</p>
<p>Adding KOH, on the other hand, would raise the pH by neutralizing the acid, NH4, and thus raising the pH. We have to assume that they are added in equal quantities, which would lead to a neutral pH of 7.</p>
<p>Eudiometer is TTCE, i just realized it was from the sparknotes test so was
the zinc galvanized one luckily i got both right
the alpha particle was also from the sparknotes test it was FF</p>
<p>o_o</p>
<p>For the Rutherford one, I remember it as:</p>
<p>Only a small amount of alpha particles hitting the gold foil are deflected, because the nucleus makes up only a small percentage of the overall volume of the atom.</p>
<p>Which would be TTCE</p>
<p>I don’t remember anything about an ice bath or crystallization.</p>
<p>^rockermcr, are you saying the answer is KOH?</p>
<p>
</p>
<p>An atom is 99% empty. Less than 1% of its volume is occupied by the nucleus. Would you call this a large part of the volume? Also, in Rutherford’s experiment, most of the alpha particles passed straight through the gold sheet. A minority were deviated and even fewer were deflected.</p>
<p>I am saying the answer is KOH. I’d be able to say so with more certainty if I saw the actual question, but that’s what I think.</p>
<p>I’ve caught numerous mistakes on the Sparknotes tests, shaheiruddin.</p>