Alkalinity Mud

Summary

In this video, the procedure for measuring the alkalinity of a fluid sample, known as PM, is demonstrated. The process involves extracting a precise 1 cc of the sample, diluting it with distilled water, and adding an indicator (f of tailing) that turns pink if the pH is above 8.3. The sample is then titrated with a weak sulfuric acid solution until the pink color disappears, indicating the solution has reached a pH of 8.3. The amount of acid used, 2.9 cc in this case, is recorded as the final PM value, providing an accurate measurement of the fluid's alkalinity.

Takeaways

• 😀 The procedure involves measuring the alkalinity of a fluid, referred to as 'PM'.
• 😀 A syringe is used to take a sample of exactly 1 cc from the fluid.
• 😀 The sample is diluted with 50 cc of ionized water to prepare for analysis.
• 😀 An indicator, phenolphthalein, is added to the sample to show the pH level, which turns pink when pH is above 8.3.
• 😀 Phenolphthalein indicator is added in 13 drops to detect alkalinity.
• 😀 A mild solution of sulfuric acid (0.02 normal) is used for titration to neutralize the sample.
• 😀 The sulfuric acid is carefully dropped into the sample while stirring and counting the volume added.
• 😀 The endpoint of the titration is reached when the pink color of the sample completely disappears, indicating the pH has reached 8.3.
• 😀 The total volume of sulfuric acid required for neutralization is 2.9 cc.
• 😀 The final pH at the endpoint, when the pink color disappears, is used to determine the 'PM' or pH of tailing point of the whole mud.

Q & A

What is the purpose of the procedure described in the script?

The procedure aims to measure the alkalinity of the fluid (PM) by titrating it with sulfuric acid and determining the pH at the endpoint.

How is the sample of PM prepared for testing?

The sample is collected using a syringe, where exactly 1 cc of the fluid is drawn into the syringe for testing.

What type of water is added to the sample and why?

Distilled or ionized water is added to the sample in order to dilute it, with 50 cc added in total to ensure a proper titration process.

What is the role of the indicator in the titration process?

The indicator, phenolphthalein, is used to signal when the pH of the sample reaches above 8.3, causing the solution to turn pink.

How many drops of the indicator are added to the sample?

Approximately 10 to 15 drops of the phenolphthalein indicator are added to the sample, with a total of 13 drops used in this case.

What does the pink color of the sample indicate?

The pink color indicates that the pH of the sample is above 8.3, signaling that the solution is alkaline.

What is the concentration of the sulfuric acid used in the titration?

The sulfuric acid used in the titration has a concentration of 0.02 normal, which is a very dilute solution.

How is the titration process performed?

The titration is done by carefully adding the sulfuric acid while stirring the sample until the pink color disappears, which indicates that the pH has dropped below 8.3.

What signifies the endpoint of the titration?

The endpoint is reached when the pink color completely disappears, indicating that the pH has reached 8.3, and the acid has neutralized the sample.

How much sulfuric acid is used to reach the endpoint in this experiment?

In this experiment, 2.9 cc of the 0.02 normal sulfuric acid is required to neutralize the sample and reach the pH of 8.3.