What Is The Titration Change In Ph Of Citric Acid
Shanee Dandridge
Garr
E Block
February 13, 2015
Titration Lab Title
Abstract
During this experiment the change in pH of Citric acids is measured from start to equilibrium in mL. This experiment was tested by titration it had two separate trials. Through observations it was shown that the more concentrated acids needed more drops of NaOH to reach its equilibrium then the less concentrated acids.
Introduction
Sodium Hydroxide (NaOH) is a strong base and when it is titrated with a strong acid the equivalence point will be expected to be a pH of 7 (wyzant.com, Feb. 12). NaOH is also known as caustic soda, it is soluble in water, ethanol, and glycerol but is insoluble in acetone and ether (nap.edu, Feb. 12). When Phenolphthalein a weak acid and when hydroxide ions (NaOH) is added the indicator is turned pink (Chemguide.co.uk, Feb.12).
The objective was to titrate a solution of Citric acid and Phenolphthalein, with a base, (NaOH), in order to determine the concentration of the base through qualitative and quantitative observations.
The hypothesis was if the acid took more NaOH to turn pink then the concentration was higher.
Materials and Methods …show more content…
Then a buret was placed onto a holder and ring stand containing NaOH the base (Fig. 1). Then an Erlenmeyer flask was filled with 10mL of one of the five citric acid samples. Then 3 drops of Phenolphthalein were added to the Erlenmeyer flask. After that the flask was placed below the buret. Then the starting volume of the NaOH in the buret was recorded. Slowly the buret was opened and the base and acid were mixed drop by drop while it was mixed. After the acid remained a consistent pink (Fig. 2) for 30 seconds the remaining volume of the NaOH in the buret was recorded. Then the flask was rinsed with water and distilled water. After that the process was repeated twice for the remaining four acids totaling with 10 total pieces of data 2 for each
Garr
E Block
February 13, 2015
Titration Lab Title
Abstract
During this experiment the change in pH of Citric acids is measured from start to equilibrium in mL. This experiment was tested by titration it had two separate trials. Through observations it was shown that the more concentrated acids needed more drops of NaOH to reach its equilibrium then the less concentrated acids.
Introduction
Sodium Hydroxide (NaOH) is a strong base and when it is titrated with a strong acid the equivalence point will be expected to be a pH of 7 (wyzant.com, Feb. 12). NaOH is also known as caustic soda, it is soluble in water, ethanol, and glycerol but is insoluble in acetone and ether (nap.edu, Feb. 12). When Phenolphthalein a weak acid and when hydroxide ions (NaOH) is added the indicator is turned pink (Chemguide.co.uk, Feb.12).
The objective was to titrate a solution of Citric acid and Phenolphthalein, with a base, (NaOH), in order to determine the concentration of the base through qualitative and quantitative observations.
The hypothesis was if the acid took more NaOH to turn pink then the concentration was higher.
Materials and Methods …show more content…
Then a buret was placed onto a holder and ring stand containing NaOH the base (Fig. 1). Then an Erlenmeyer flask was filled with 10mL of one of the five citric acid samples. Then 3 drops of Phenolphthalein were added to the Erlenmeyer flask. After that the flask was placed below the buret. Then the starting volume of the NaOH in the buret was recorded. Slowly the buret was opened and the base and acid were mixed drop by drop while it was mixed. After the acid remained a consistent pink (Fig. 2) for 30 seconds the remaining volume of the NaOH in the buret was recorded. Then the flask was rinsed with water and distilled water. After that the process was repeated twice for the remaining four acids totaling with 10 total pieces of data 2 for each