Recognizing Acid/Base Properties when lonies are Dissolved in Water 60. Aqucous
ID: 636348 • Letter: R
Question
Recognizing Acid/Base Properties when lonies are Dissolved in Water 60. Aqucous solutions of-_ are basic. a. NaF b. NaCi e. NaBr d. Nal e. KI 61. Which one of the following salts forms aqueous solutions with pH-7 a. Na S b. NaBr c. NaCIO d. NaNO c. Na CO 62. Which oee of the following salts forms aqucous solutions with pH-7 a. NaCN b. NH4Br c. NaNO d. Nal POs e. Na CO 63. Which one of the following salts does net prodace a basic solution when dissolved in water? a. NaOCH b. NaHSO c. NaBrO d NaNO e. NaHCO 64. The pH of an aqueous sodium flooride (NaF) solution is T because a. 7; sodium fluoride is a simple salt b. above 7; fluoride is a weak base. e. below 7; fluoride reacts with water to make hydrofluoric acid. d. about 7: Quoride is a weak base, but produces hydrofluoric acid, and these two neutralize one another e. 0: sodium fluoride is a salt not an acid or a base. 65. Which one of the following, A-D, is correet? If all are correct, respond E a. K,SO, is a stronger base than KHSO, b. K,CO, is a weaker base than KHCO, c. NaHSO, is a stronger acid than NaHSO, d. Na,HPO, is a weaker base than NaH PO e. All of these statements are correct 66. Which of the following groups, A-D, consist of salts that all form basic solutions in water? (Ac- acetate) If none or all satisfy this criterion, respond E. a. NaNO,, NH CN, NaAc, NH.C c. Na CO, NaF, Na0OCH, NaCN d. NaHC0,, NaF, NH4CI, Na SO, e. None or all of the above.Explanation / Answer
Q.60: NaF(s) + H2O <----> HF(aq) + Na+(aq) + OH-(aq)
Since HF is a very weak acid, number of hydroxide ion, OH-(aq) formed is higher than H+(aq) ions formed. Hence aqueous solution of NaF is basic.
Hence option (a) is correct.
Q.61: Since NaBr is a salt formed by the neutralization reaction of strong acid (HBr) and strong base (NaOH), its aqueous solution is neutral (pH = 7).
HBr(aq) + NaOH(aq) -----> NaBr(aq) + H2O(l) (neutral, pH = 7)
Hence option (b) is correct.
Q.62: Since NaNO3 is a salt formed by the neutralization reaction of strong acid (HNO3) and strong base (NaOH), its aqueous solution is neutral (pH = 7).
HNO3(aq) + NaOH(aq) -----> NaNO3(aq) + H2O(l) (neutral, pH = 7)
Hence option (c) is correct.
Q.63: NaHSO4 when dissolved in water forms H+(aq) and SO42-(aq).
NaHSO4(s) + H2O <---> H+(aq) + SO42-(aq) + Na^+(aq)
Due to the formation of H+(aq), the aqueous solution of NaHSO4 is acidic.
Hence option (b) is correct.
Q.64: NaF(s) + H2O <----> HF(aq) + Na+(aq) + OH-(aq)
Since HF is a very weak acid, number of hydroxide ion, OH-(aq) formed is higher than H+(aq) ions formed. Hence aqueous solution of NaF is basic.
Hence pH is above 7, fluoride is a weak base due to the formation of OH-(aq)
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