PERFORMING A TITRATION USING A BURET Titration is the procedure used to standard

Question

PERFORMING A TITRATION USING A BURET Titration is the procedure used to standardize e. determine the concentration of, a reagent. To perform a titration between two reagents, a precise volume of one of the reagents is added from a buret to a known quantity of the other reagent. The concentration of one of the reagents is known By determining the exact amount of the other reagent required to react stoichiometrically with the reagent of known concentration, you can calculate the concentration of the second reagent. During the titration, small increments of the reagent contained in the buret are added, with constant stirring, to the other reagent which is typically contained in an Erlenmeyer flask. Titrating into an Erlenmeyer flask allows for the ease of constant swirling without splashing. In some cases a magnetic stir plate is used in place of manual stirring. A stirrerhot plate combination is particularly useful with reactions requiring elevated temperatures The stoichiometric "endpoint" of the reaction is indicated by a color change to the mixture. This color change can be the result of the reaction itself or to the addition of an indicator. Titrations are very precise when performed correctly. Burets are accurate to two decimal places. Read the bottom of the meniscus going down, not up. Practice is the key to prec on. Follow your instructor's comments carefully buret contaning base fiask contaning vinegar indicator Titration set-up using a Typical magnetic stirrer titration set-up

Explanation / Answer

1) Barium chloride and copper (II) sulphate

a) molecular equation will be

BaCl2(aq) + CuSO4(aq) --> BaSO4(s) + CuCl2(aq)

b) ionic equation will be

Ba2+ + 2Cl- + Cu2+ + SO42- --> BaSO4(s) + Cu2+ + 2Cl-

c) net ionic equation will be

Ba2+ + SO42- --> BaSO4(s)

2) Solid magnesium and hydrochloric acid

a) molecular equation

Mg(s) + 2HCl(aq) ---> MgCl2 + H2(g)

b) ionic equation

Mg(s) + 2H+(aq) + Cl-(aq) ---> Mg+2 + 2Cl- + H2(g)

Net ionic equation will be:

Mg(s) + 2H+(aq) ---> Mg+2 + H2(g)

3) Potassium chloride and sodium nitrate

molecular equation

KCl(aq) + NaNO3(aq) --> KNO3(aq) + NaCl(aq)

Ionic equation

K+(aq)   + Cl- (aq)   + Na+(aq) + NO3-(aq) ---> K+(aq)   + Cl- (aq)   + Na+(aq) + NO3-(aq)

No net ionic equation

4) sodium carbonate and sulphuric acid

Molecular equation:

Na2CO3(aq) + H2SO4(aq) --------> Na2SO4(aq) + H2O(l) + CO2 (g)

ionic equation

2Na+(aq) + CO3-2 (aq) + 2H+(aq) + SO4-2 (aq) ---------> SO4-2 (aq)+ H2O(l) + CO2(g) + 2Na+(aq)

Net ionic equation

CO3-2 (aq) + 2H+(aq) ---------> H2O(l) + CO2(g)

5) Ammonium chloride and water

Molecular equation

NH4Cl(s) + H2O(l) ----> [NH4]+(aq) + [Cl]-(aq) + H2O(l)

Ionic equation

NH4Cl(s) + H2O(l) ----> [NH4]+(aq) + [Cl]-(aq) + H2O(l)

Net ionie equation

NH4Cl(s) ----> [NH4]+(aq) + [Cl]-(aq)

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