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Sodium hydroxide solution was standardized against one gram of potassium phthalate. First trial used 52.0 ml of the solution while the second trial used 52.4 of the solution to reach the end point. (a) What is the standardized concentration of the solution? (b) If the task is to prepare a one tenth of a molar solution, what is the percent accuracy of the preparation? The standardized basic solution was then used in getting the total acidity of a food sample. Ten milliliter of the acidic sample consumed 10.3mLl in the first trial then 10.0ml. in the second trial to reach endpoint. (c) What is the normality of the acidic sample?

Sodium hydroxide solution was standardized against one gram of potassium phthalate. First trial used 52.0 ml of the solution while the second trial used 52.4 of the solution to reach the end point. (a) What is the standardized concentration of the solution? (b) If the task is to prepare a one tenth of a molar solution, what is the percent accuracy of the preparation? The standardized basic solution was then used in getting the total acidity of a food sample. Ten milliliter of the acidic sample consumed 10.3mLl in the first trial then 10.0ml. in the second trial to reach endpoint. (c) What is the normality of the acidic sample?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Sodium hydroxide solution was standardized against one gram of potassium phthalate. First trial used 52.0 ml of the solution while the second trial used 52.4 of the solution to reach the end point. (a) What is the standardized concentration of the solution? (b) If the task is to prepare a one tenth of a molar solution, what is the percent accuracy of the preparation? The standardized basic solution was then used in getting the total acidity of a food sample. Ten milliliter of the acidic sample consumed 10.3ml in the first trial then 10.0ml in the second trial to reach endpoint. (c) What is the normality of the acidic sample? Compute the total acidity of the food sample assuming that ten grams of sample was dissolved to 25ml of solution if the sample is: (d) Milk (MW, lactic acid =90) (e) Juice (MW, citric acid = 192.4; one mole citric acid reacts with three moles NaOH) (f) Vinegar (MW, acetic acid = 60) If you are a food safety inspector, would the sample pass if (include reason) (g) Safe and unspoiled milk contains 0.12-0.14% lactic acid only? (h) The stomach can only withstand 0.39-1.1% citric acid?
Transcribed Image Text:Sodium hydroxide solution was standardized against one gram of potassium phthalate. First trial used 52.0 ml of the solution while the second trial used 52.4 of the solution to reach the end point. (a) What is the standardized concentration of the solution? (b) If the task is to prepare a one tenth of a molar solution, what is the percent accuracy of the preparation? The standardized basic solution was then used in getting the total acidity of a food sample. Ten milliliter of the acidic sample consumed 10.3ml in the first trial then 10.0ml in the second trial to reach endpoint. (c) What is the normality of the acidic sample? Compute the total acidity of the food sample assuming that ten grams of sample was dissolved to 25ml of solution if the sample is: (d) Milk (MW, lactic acid =90) (e) Juice (MW, citric acid = 192.4; one mole citric acid reacts with three moles NaOH) (f) Vinegar (MW, acetic acid = 60) If you are a food safety inspector, would the sample pass if (include reason) (g) Safe and unspoiled milk contains 0.12-0.14% lactic acid only? (h) The stomach can only withstand 0.39-1.1% citric acid?
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