7. (1 pt) what is the equivalence point? What is the endpoint of a titration? Ho

Question

7. (1 pt) what is the equivalence point? What is the endpoint of a titration? How do we know when we have reached the equivalence point when titrating KHP or the so pop sample with sodium hydroxide? hydroxide solution. The initial reading from the burette containing the NaoH was o 52 mL After the titration was complete, the NaoH volume reading was 32.86 mL. Calculate the molarity of the NaOH solution. Show all work and every conversion unit. 9. (1 pt) How many moles of NaoH are required to titrate one mole of citric acid? write this relationship as a unit conversion factor. You will need this conversion factor today to convert from moles of sodium hydroxide to moles of citric acid.

Explanation / Answer

7)

Equivalence point : The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of acid and base have been mixed.

End point : End point indicates the completion of reaction in acid - base titration.

when number of moles of acid is equal to number of moles of base then it is reached the equivalent point.

moles of standard solution equal to the moles of unknown concentration solution.

8)

mass of KHP = 0.1421 g

molar mass of KHP = 204.23 g/mol

moles of KHP = mass / molar mass = 0.1421 / 204.23 = 6.96 x 10^-4

volume of NaOH = 32.86 - 0.52 = 32.34 mL

moles of KHP = moles of NaOH

6.96 x 10^-4 = 0.03234 x M

Molarity of NaOH = 0.021 M

9)

H3C6H5O7 + 3NaOH -----------------> Na3C6H5O7 + 3H2O

citric acid + sodium hydroxide --------> sodium citrate + water

1 mole of citric acid ---------------- 3 mol of NaOH

3 moles of NaOH required to titrate 1 mol of citric acid.

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