For the following salt, show the ions which are formed in aqueous solution NaCl,

ID: 842075 • Letter: F

Question

For the following salt, show the ions which are formed in aqueous solution

NaCl, Na2CO3, NaCH3CO2, NaHSO4

Because sodium ion does not react appreciably in water it is not considered either an acid or base and for each of the salts above it is the anion which gives rise to the acidic or basic characteristics it may show in water. Use the information to predict whether the pH of a solution of each of the salts listed in question 1 will be acidic basic or neutral and explain your answer in each case.

3) Name each of the molecules or ions in the following acid/base pairs. Identify the appropriate component of each pair as an acid or conjugate base.

CH3CO2H, CH3CO2-

NH4+, NH3

HCO3-, CO32-

Explanation / Answer

Part A

We are already told why the sodium ions do not contribute any acidic or basic character to solution. Thus, we look to the anions of each pair.

The ions formed from NaCl will be Na+ and Cl-. Recall that the conjugate acid of Cl- is HCl, a strong acid. Since the conjugate acid is strong, that much mean the anion (base) is quite weak. Thus the pH will be neutral.

The ions formed from Na2CO3 will be Na+ and CO32-. Recall that the conjugate acid of CO32- is the weak acid HCO3-. Since the conjugate acid is weak, that must impart some basic character to the anion. Thus the pH will be basic.

The ions formed from NaCH3CO2 are Na+ and CH3CO2-. Recall that CH3CO2H is the conjugate acid of CH3CO2- and that it is a weak acid. Since it is a weak acid, that must impart some basic character to the anion. Thus the pH will be basic.

The ions formed from NaHSO4 are Na+ and HSO4-. Recall that HSO4- is the conjugate base of a strong acid, H2SO4. Since the acid is strong, the anion contributes no acidic or basic character. Thus the pH will be neutral.

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Part B

CH3CO2H is acetic acid. Then CH3CO2- is the acetate ion and is the conjugate base.

NH4+ is the ammonium ion. It is the conjugate acid of NH3 , which is ammonia.

HCO3- is the bicarbonate ion. It is the conjugate acid of CO32-, which is the carbonate ion.

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For the following salt, show the ions which are formed in aqueous solution NaCl,

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