Title: Plan and Design (Investigative Project – Proposal)
Problem Statement: Krisann and her friend, Aneika having lunch when they Krisann decided to offer Aneika some of her favourite soda. Aneika insisted that Krisann’s brand was more acidic, however she was not convinced. As a CAPE student, on passing Krisann and Aneika's lunch table, overheard their dispute and now you are required to plan and design an experiment to determine which brand of soda is more acidic .
Theory: All soda has carbon dioxide in it, which forms carbonice acid in aqueous liquids.Soda contains phosphoric acid and carbonic acid this contributes to its acidic charecteristics.The technique titration can be used to determine the concentration of acid presented in soda using a solution with known concentration. Phenophthlein is a good indicator for the reaction because it responds to PH change by the formation of carbonic acid.It is pink in basic solutions and turns colorless as soon as the solution becomes acidic.
Hypothesis: Sprite will be more acidic than Ting when the NaOH and phenolphthlein is added reaching its endpoint.
Aim: To determine if spite soda is more acidic than ting.
Apparatus: Pepsi, Coco cola, 2 tarnished pennies, two plastic cup and marker. Procedure:
Procedure: Rinse the equipment with the appropriate solution.
Mark 0.5M of Sprite soda and measure with a pipette placing it in a conical flask.
Fill the burette to zero mark with the standard 0.1molNaOH ensuring no air bubbles are in the tip.
Drop Two(2) drops of phenolphtlein indicator to the conical flask and swirl.Titrate the conical flask with constant swirling against the soda until one drop of acid turns the soda purple.
