sUNY at old Westbury CP21300o2chemio Prineiples Fall.2017 Dr. Konrad Wu plea ot
ID: 579960 • Letter: S
Question
sUNY at old Westbury CP21300o2chemio Prineiples Fall.2017 Dr. Konrad Wu plea ot Chemiotry I1 Student Name. Choice and short Anewer Questione (5 Points each) of the following aqueous solutions in leant aciaie Periodic Table: a) Hcio b) HasO c) HaSeo d) HNO VAVIA VILA IA IIA Li Be C1. BI Ha ca K Ca Rb Sr 2. Which of the following aqueous o.1 M solutions has the highest pH a) KOH b) Ca (c1o) 2 c) Ca (OH)2 d) Kci04 which of the following aqueous solutions is acidic? a) Nac1o b) LiF c) CrCl d) KNOs Which of the following form a buffer if added to 120 mL of o aCH3 Coo solultion? )0.100 mol of HC1 0.050 mol of HCl 0.010 mol of HC1 None of the above titration curve below is more likely derived from HPOs, Phosphoric acid 2SO4, Sulfuric acid H3COOH, Acetic acid C204, Oxalic acid Volume of NaOH, mLExplanation / Answer
1. d) HNO3 is least acidic.
Explanation: HClO3, H2SO3, H2SeO3 and HNO3 all are oxoacids, where oxygen is bonded to the hydrogen and the other atom. The more electronegative the atom attached to the O, the more acidic the oxoacid. This is because the more electronegative atom attached the more electrons withdrawing it is from the O-H bond. This then makes the O-H bond more polar, and so more acidic. Acid strength increases with increasing electronegativity of central atom. Since electronegativity tends to increase from left to right on the periodic table, Cl atom is most electronegative among N, S, Se and Cl. So, HClO3 is most acidic. S and Se are of same group VIA. Since electronegativity tends to increase down the group on the periodic table, Se is more electronegative and H2SeO3 is more acidic than H2SO3. N is group VA element, so it is least electronegative among N, S, Se and Cl. So, HNO3 is least acidic.
2) a) KOH
Second group hydroxides it is relatively a weak base than first group hydroxide, so KOH has highest PH
3)c) CrCl3
LiF, NaClO3 and KNO3 are neutral. They are salt of strong acid and strong base.
4.d) none
A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa.
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