An aliquot of 20 ml of skim milk was placed in an Erlenmeyer flask. To the flask was added 3 to 4 drops of phenolphthalein. The sample was titrated in triplicate using a previously standardized NaOH solution 0.101M. The volumes of NaOH spent in the three experiments to reach chemical equivalence were 3.6ml, 3.7ml and 3.5ml. 1) Express the acidity of milk in g/L of lactic acid. 2) Assuming that the only acid present in milk is lactic acid, would you expect the
An aliquot of 20 ml of skim milk was placed in an Erlenmeyer flask. To the flask was added 3 to 4 drops of phenolphthalein. The sample was titrated in triplicate using a previously standardized NaOH solution 0.101M. The volumes of NaOH spent in the three experiments to reach chemical equivalence were 3.6ml, 3.7ml and 3.5ml. 1) Express the acidity of milk in g/L of lactic acid. 2) Assuming that the only acid present in milk is lactic acid, would you expect the
Chapter13: Titrations In Analytical Chemistry
Section: Chapter Questions
Problem 13.12QAP
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![An aliquot of 20 ml of skim milk was
placed in an Erlenmeyer flask. To the
flask was added 3 to 4 drops of
phenolphthalein.
The sample was
titrated in triplicate using a previously
standardized NaOH solution 0.101M.
The volumes of NaOH spent in the
three experiments to reach chemical
equivalence were 3.6ml, 3.7ml and
3.5ml. 1) Express the acidity of milk in
g/L of lactic acid. 2) Assuming that
the only acid present in milk is lactic
acid, would you expect the
pH corresponding to the equivalence
point was 7?.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F42649c46-663f-4f96-b3e3-02eea442abeb%2F2d9be405-4ff2-4678-b3e8-0cb14089c655%2F0g5bv0e_processed.jpeg&w=3840&q=75)
Transcribed Image Text:An aliquot of 20 ml of skim milk was
placed in an Erlenmeyer flask. To the
flask was added 3 to 4 drops of
phenolphthalein.
The sample was
titrated in triplicate using a previously
standardized NaOH solution 0.101M.
The volumes of NaOH spent in the
three experiments to reach chemical
equivalence were 3.6ml, 3.7ml and
3.5ml. 1) Express the acidity of milk in
g/L of lactic acid. 2) Assuming that
the only acid present in milk is lactic
acid, would you expect the
pH corresponding to the equivalence
point was 7?.
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