13 12 10 7 0 10 20 30 50 Volume of NaOH added (ml.) Using the titration curve ab

Question

13 12 10 7 0 10 20 30 50 Volume of NaOH added (ml.) Using the titration curve above, answer the following questions Post-Equivalence Point after 40.00 mL. of base have been added to the acid-base neutralization chemical reaction asing correct significant figures and decimal only notation, do NOT units in your answer. Blank #1: Volume of titrant used (mL): Blank #2: Moles of sodium hydroxide added (mol) Blank #3: Moles of acetic acid remaining (no Blank #4: pH: Blaak #5: Identify the limiting reactant and the non-limiting reactant as sodium hydroxide, acetic acid, or neither: X

Explanation / Answer

Answer:

Blank#1:In the conductrometric titrations,the chemical present in burette is known as the titrant.Here NaOH is the titrant and its volume is 50 ml.

Blank#2: Molarity= number of moles of solute/volume of solution in litres

or simply M=n/v or n=M*V.

To calculate the number of moles of NaOH,we need to find out the molarity first.

Since we are considering our calculations after the equivalence point,we shall consider the volume of NaOH to be 25ml.

At the 50ml mark,pH=12.2

pH+pOH=14

pOH=14-12.2

pOH=1.8

pOH= -log(OH)

So, 1.8= -log(OH)

2.303 *1.8= 2.303 *-log (OH)

4.1454 = -ln(OH)

exp(-4.1454) =(OH)

0.0158 moles/litre=(OH),this is our M(Molarity) value.

V(Volume) of NaOH=25ml=25/1000litre

Now using the formula,we can find the number of moles.

n=M*V

=0.0158*25/1000

=0.000395 moles

Blank#3: Since the chemical reaction between acetic acid and NaOH has achieved its equivalence points,(the point at which the reactants have completed reacted) zero moles of acetic acid remains after the equivalence point.

Blank#4: As can be seen in the graph pH after 40ml mark is 12.2.

Blank#5: Of the two reactants,the reactant that gets completely consumed during the course of reaction is called the limiting reactant.It limits the production of products and the reactant present in excess is the non limiting reactant.

In the given reaction,acetic acid gets consumed completely,so it is the limiting reactant whereas NaOH is the non limiting reactant as it is present in excess.

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