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 K 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 HCl(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 flavour 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

1. Yes, the volumeof solution being analyzed matters as the pH ( - log(H3O+) is affected by changes in volume.

2. The glassware and equipment used must be properly cleaned and perfectly dry before using them for pH measurements.

3. We calibrate the pH electrode at the start and in betweeen measurements using buffers of known concentrations. in order to ensure that the pH measurements are being done correctly.

4. The data recorded includes pH and the volume of the test solutions added.

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