1) Which solution will have the lowest OH-
A) Na2CO3
B) NaHCO3
C) NaCl
D) NaHSO4
E) NH4Cl
2) Which solution will be the strongest base?
A) Na2CO3
B) NaHCO3
C) NaCl
D) NaHSO4
E) NH4Cl
3) Which aqueous solutions are acidic?
A) Na2CO3 and NaHCO3
B) NaCl and NH4Cl
C) NaHSO4 and NH4Cl
D) NaHSO4 and NaHCO3
E) NaHSO4, NaHCO3, and NH4Cl
What is the order of increasing pH (lowest pH) first) of the solutions?
A) Na2CO3 <NaHCO3<NaCl< NH4Cl
B) NaCl < Na2CO3 < NaHCO3 < NH4Cl
C) NH4Cl < NaHCO3 < NaCl < Na2CO3
D) NH4Cl < NaCl < NaHCO3 < Na2CO3
E) Na2CO3 < NaCl < NaHCO3 < NH4Cl
Which solution will have the highest concentration of Na+ ions?
A) Na2CO3
B) NaHCO3
C) NaCl
D) NaHSO4
E) All are equal
If you could include explanations it would be greatly appreciated!
1) Which solution will have the lowest OH-
A) Na2CO3
B) NaHCO3
C) NaCl
D) NaHSO4
E) NH4Cl
The lowest OH will be the highest H^+ so which is the strongest acid?
You can go through and eliminate most of these. You know CO3^2- hydrolyzes extensively so you know they are basic due to that.
CO3^2- + HOH ==> HCO3^- + OH^-.
NaHCO3 solution generally have H^+ = sqrt(k1k2) which makes them approximately pH = 8.5
NaCl you know is neutral (but more acid than A or B).
NaHSO4 you know is acid due to k2 of HSO4^-. The NH4^+ of NH4Cl hydrolyzes to produce H3O^+ by
NH4^+ + H2O ==> H3O^+ + NH3 but you know solution of NH4^+ salts are about 5.3 pH or so. So D is the most acid.
3) Which aqueous solutions are acidic?
A) Na2CO3 and NaHCO3
B) NaCl and NH4Cl
C) NaHSO4 and NH4Cl
D) NaHSO4 and NaHCO3
E) NaHSO4, NaHCO3, and NH4Cl
A. If Na2CO3 is very basic and NaHCO3 is slightly basic, then a mixture should be acid or basic....?
B. NaCl is neutral; NH4Cl is slightly acid so ....
C.NaHSO4 and NH4Cl. NaHSO4 is quite acid; NH4Cl slightly acid so the mixture will be ......
D. NaHSO4 + NaHCO3 is an acid + base and it gives Na2SO4 + H2O + CO2. Since neither Na^+ nor SO4^2- are hydrolyzed this is neutral
E.NaHSO4 + NaHCO3 + NH4Cl. You know from D that NaHSO4 and NaHCO3 produces a neutral solution. Adding NH4Cl, which you know produces a slightly acid solution, will give a solution that is ......
5.
Which solution will have the highest concentration of Na+ ions?
A) Na2CO3
B) NaHCO3
C) NaCl
D) NaHSO4
E) All are equal
There is no answer for this one BECAUSE there is no concn listed for any of them. For equal concentrations, which probably is what the asker meant, is A because there are more Na atoms per molecule than any of the others.
b
a
c
d
c
1) To determine the solution with the lowest OH- concentration, we need to look at the compounds that produce OH- ions when dissolved in water. OH- ions are formed in solutions when hydroxide (OH-) molecules dissociate. The greater the dissociation, the higher the OH- concentration in the solution.
A) Na2CO3: This compound contains carbonate ions (CO3^2-) and does not directly produce OH- ions.
B) NaHCO3: This compound contains bicarbonate ions (HCO3-) and does not directly produce OH- ions.
C) NaCl: This compound contains chloride ions (Cl-) and does not produce OH- ions.
D) NaHSO4: This compound contains sulfate ions (HSO4-) and does not produce OH- ions.
E) NH4Cl: This compound contains ammonium ions (NH4+) and chloride ions (Cl-), neither of which produce OH- ions.
Since none of the given compounds directly produce OH- ions, we can conclude that all the solutions have negligible OH- concentrations. Therefore, all solutions can be considered as having the same, very low, OH- concentration.
2) To determine the strongest base, we need to look at the compounds that produce OH- ions when dissolved in water. The greater the concentration of OH- ions, the stronger the base.
A) Na2CO3: This compound dissociates to produce carbonate ions (CO3^2-) and therefore produces OH- ions.
B) NaHCO3: This compound dissociates to produce bicarbonate ions (HCO3-) and therefore produces OH- ions.
C) NaCl: This compound does not produce OH- ions.
D) NaHSO4: This compound does not produce OH- ions.
E) NH4Cl: This compound does not produce OH- ions.
Among the given options, A) Na2CO3 and B) NaHCO3 produce OH- ions when dissolved in water. However, since Na2CO3 contains carbonate ions, which can produce more OH- ions compared to bicarbonate ions in NaHCO3, Na2CO3 can be considered the stronger base.
3) To determine which aqueous solutions are acidic, we need to look at the compounds that produce H+ ions (or H3O+ ions, which is the same as H+) when dissolved in water. The greater the concentration of H+ ions, the more acidic the solution.
A) Na2CO3 and NaHCO3: These compounds do not produce H+ ions and therefore are not acidic.
B) NaCl and NH4Cl: These compounds do not produce H+ ions and therefore are not acidic.
C) NaHSO4 and NH4Cl: NH4Cl does not produce H+ ions, but NaHSO4 does produce H+ ions and therefore is acidic.
D) NaHSO4 and NaHCO3: NaHCO3 does not produce H+ ions, but NaHSO4 does produce H+ ions and therefore is acidic.
E) NaHSO4, NaHCO3, and NH4Cl: NaHSO4 produces H+ ions and therefore is acidic, whereas NaHCO3 and NH4Cl do not produce H+ ions and are not acidic.
Therefore, the solutions that are acidic are C) NaHSO4 and NH4Cl.
4) To determine the solution with the highest concentration of Na+ ions, we need to consider the dissociation of the compounds in water and the number of Na+ ions produced.
A) Na2CO3: This compound dissociates into two Na+ ions and one carbonate ion.
B) NaHCO3: This compound dissociates into one Na+ ion, one HCO3- ion, and one H+ ion.
C) NaCl: This compound dissociates into one Na+ ion and one Cl- ion.
D) NaHSO4: This compound dissociates into one Na+ ion, one HSO4- ion, and one H+ ion.
E) All are equal: This would be the case if all the compounds dissociated into the same number of Na+ ions.
Among the given options, A) Na2CO3 produces the highest concentration of Na+ ions since it dissociates into two Na+ ions, while the other options only produce one Na+ ion each.
Therefore, the solution with the highest concentration of Na+ ions is A) Na2CO3.
4.
Based on my responses above what do you think. A is not right.
2) Which solution will be the strongest base?
A) Na2CO3
B) NaHCO3
C) NaCl
D) NaHSO4
E) NH4Cl
My response to #1 should give youthe answers to #2.