Full Answer. The study concluded that fresh-squeezed orange juice contains 9.1 grams per liter of citric acid and that Tropicana processed orange juice contains 16.9 grams per liter of citric acid. Lemon juice and grapefruit juice also contain citric acid.
Citric acid is a relatively strong weak acid, but no special precautions are required for its use. Citric acid powder is sold for home use with no restrictions. The pH of 0.033 M citric acid is about 2.2, which is slightly higher than that of lemon juice.4 The 0.1 M sodium hydroxide and the phenolphthalein indicator are more hazardous.
Nov 10, 2011· Citric acid is found in many fruits and fruit juices. Sodium hydroxide (NaOH) is the titrant and citric acid (H3C6H5O7) the analyte according to the following balanced chemical equation. the stoichiometry of H3C6H5O7 to OH– is 1:3 Complete the following table for this titration.
To evaluate the concentrations of citric acid by volume in three different samples of fruit juice. Sample Of Real Orange Juice. Procedure: • Rinse all the apparatus and dry them before use. • Take a conical flask and pour the juice sample into the burette till the 0mL mark.
Lemon juice, which contains nearly 5 times the concentration of citric acid compared to orange juice, is an inexpensive and well tolerated dietary source of citrate.
Citric acid contains three carboxylic acid functional groups and has a molecular formula of H 3C 6H 5O 7. The carboxylic acid functional group is pictured to the left. Structurally, citric acid is written as pictured. Each proton of each carboxylic acid group has been numbered. Citric acid, when dissolved in water, becomes a triprotic acid capable of
Nov 01, 2015· The idea here is that you need to find the moles of citric acid by using the molarity of the sodium hydroxide solution, then use the mass of the orange juice to find the percent concentration by mass of citric acid. Notice that your reaction needs #color(red)(3)# moles of sodium hydroxide for every mole of citric acid.
The anhydrous form crystallizes from hot water, while the monohydrate forms when citric acid is crystallized from cold water. The monohydrate can be converted to the anhydrous form at about 78 °C. Citric acid also dissolves in absolute (anhydrous) ethanol (76 parts of citric acid per 100 parts of ethanol) at 15 °C.
Page | 6 Titration of citric acid in juice – St Ignatius College Geelong 2. The burette has an open and closed valve called a stopcock. The closed and open positions are shown below: 3. Rinse the burette: add 10 mL of NaOH to the dry burette and let the solution run through burette tip to a 'waste' beaker.
Aug 28, 2010· Because we now know the moles of Citric Acid, we can determine its concentration in the original orange juice solution 4.7x10^-4 / .01L OJ = .047M Citric Acid. As Citric Acid is, as I noted above, a triprotic acid, an exact pH figure is a very messy ordeal.