Multiple Choice and Short Answer Questions (5 Points each) 1. Which of the follo
ID: 580470 • Letter: M
Question
Multiple Choice and Short Answer Questions (5 Points each) 1. Which of the following aqueous solutions is most acidic? Periodic Table: a) H2SO3 b) HNO c) H2Se03 d) HC1o3 IA IIA Li Be Na Ma K Ca Rb Sr VA VIA VIIA N P O S Se ci Br 2. Which of the following indicators would be suitable for the titration of HI with LiOH? a) methyl orange (end point at pH 4) b) bromthymol blue (end point at pH 7) c) phenolphthalein (end point at pH 9) d) All of the above 3. Which of the following aqueous 0.1 M solutions has the lowest pH? a) KOH b) Ca (Clo) 2 c) Ca (OH)2 d) KC1o4 Which of the following aqueous solutions is acidic? a) Zncl2 b) Nac1O3 c) KF d) LiNO3 4. 5. Complete the table below for the solution at 25°c. Acidic or Basic [OH-1 pH 6.28 6. Consider a 1.0 M solution of the diprotic acid H2x. H,X-H'(aq) + HX-(aq) HX-=-H'(aq) + X2-(ag) Kal .. 1.0 x 10-4 Ka2 1.0 × 10-s Calculate [HX] and [x2-].Explanation / Answer
1.
HClO3 is strongest acid because it is stronger than HNO3 which is stroger than other acids. Reason behind is this tha Nitrogen being more electonegative pulls H atom more strongly.
2.
Methyl orange is used for reactions of strong acid and weak base because its operating range is pH= 4 towards acidic side. Since LiOH is weak base methyl orange is suitable in this case.
3.
CaClO2 being the weakest base among following will give lowest pH when compared at same concentrations
4.
Salts of strong acid and weak base give acidic salts.
So LiNO3 is made of strong acid (HNO3) and weak base (LiOH) so this will be acidic among them
5.
pH=6.28 this means acidic because acidic range is pH<7
also [OH-] = 10-pOH
pOH=14-pH
= 7.72
[OH-] = 10-7.72
= 1.9 * 108 M
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