1.Explain why sodium acetate and acetic acid together in solution make a buffere
ID: 825772 • Letter: 1
Question
1.Explain why sodium acetate and acetic acid together in solution make a buffered solution, but sodium chloride and hydrochloric a cid do not make a buffered solution when mixed
2.Write the appropriate other component for the following substances to make a buffered system. Write the other component below the printed one. If one of the components is shown as an ionic c ompound with a cation or anion attached, rewrite the substance as the ion that is the actual component of the buffer.
a)HIO
b)NaCN
c) C5H5NH+
d)HF
e)NH4
f)Cl
d)KNO 2
8. Finish and balance the following:
HCl+NaOH---->
CH3COOH +NaOH ---->
NH3 + HCl --->
Show each of the ionic products written out as individual ions. Indicate whether the ions would be acidic, neutral or basic.
9.The reactions in number 8 are for a strong acid/strong base, weak acid/strong base, and weak base/strong acid, respectively. The reactions shown , with equal moles of each substance reacting, occur at the equivalence point. Generalize about the pH at the equivalence point for these three types of titrations
Explanation / Answer
Hcl is a strong acid. NaCl is formed by the reaction of Hcl and any base .But NaCl is not a covalent compound and it exists as Na+ and Cl-.Na+and OH- cannot react with EachOther in Aqueous solutions as as the are formed in aqueous solutions and they behave like ions . hence neither H+ nor OH- is consumed by this mixture whereas acetic acid and acetate ions can consume small amt of these ions.Hence the mix. act as buffer
HCL + NAOH = H2O + NACL
HC2H3O2 + NaOH = NaC2H3O2 + H2O
NH3(aq)+HCl(aq)=NH4CI(aq) (ammonium chloride)
Equivalence PointThe equivalence point is the part of the titration when enough base has been added to the acid (or acid added to the base) that the concentration of [H+] in the solution equals the concentration of [OH-]. Since [H+] = [OH-] at the equivalence point, they will combine to form the following equation:
Further adding acid or base after reaching the equivalence point will lower or raise the pH, respectively.
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