Some commonly used products (eye saline solution, mouthwash, and a beverage) as

Question

Some commonly used products (eye saline solution, mouthwash, and a beverage) as well as tap water are provided to you. Your goal is to rate these 4 solutions on their ability to buffer against addition of acid buffer against addition of base You must first plan your method of problem solving. What data do you need to meet the goals? How are you going to approach the problem in order to solve it? Which procedures will you use? As you plan your procedure and/or do it, each student should individually write it. (The written procedure style is not a group effort although the physical procedure will be the same). You cannot have one recorder for the procedure. Experiment Provided Materials and Equipment: General glassware found in the lab or in your drawer/locker 60 ml of 0.1 M HCI(aq) 60 ml of 0.1 M NaOH(aq) pH electrode and storage solution Logger Pro software Standard buffers for calibration pH 4.00 and pH 7.00 2 burets (per group of 4 students) Four solutions to test Tap water 125 mL* of Bausch & Lomb^TM Sensitive Eyes Saline Plus solution 125 ml* of Listerine^TM Cool Mint mouthwash 125 ml of Nestea^TM Iced Tea white peach flavor Note that the volume is the maximum you should use in your experiment. Design your procedure with this in mind. Designing your Procedure The following questions should be considered when designing your procedure. Does the amount of test solution matter? What amount will you use? What type of glassware or equipment will you use to measure solutions? How will you ensure the pH electrode is measuring pH correctly? What data is important to record?

Explanation / Answer

We have to check the ability of buffer after addition of acid and base to these four solution by measuring the pH by using pH electrode.

The solutions namely are:

1) tap water,

2) eyes saline solution,

3) mouth wash,

4) tea flavour,

while designing our procedure we have to check the pH changes after addition of acid and base to all these samples,

1) The amount of test solution matters the results, if we add more sample we have to use more amount of acid or base.(at the equivalance point ) means that how acidic or basic the given sample is , or it may be neutral ,

2) glasswares requires are burrette, pippete, conical flask beakers , volumetric flask, measuring cylinder etc,

3) pH electrode is measuring the pH correctly is ensured by calibrating it with the pH of standard solution,

4) all pH readings to be record , with acid as well as base,

molarity of acid and base is to be recorded.

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