describe how you would prepare 100g of a solution that is 0.5% phenolphthalein by mass
Answers
Answer:
Distilled water should be used to prepare the solution to prevent any impurities from affecting the accuracy of the solution.
Explanation:
To prepare 100g of a solution that is 0.5% phenolphthalein by mass, you would need to follow these steps:
Calculate the mass of phenolphthalein required:
0.5% of 100g = (0.5/100) x 100g = 0.5g
Weigh out 0.5g of phenolphthalein using a balance and transfer it to a clean and dry 100mL volumetric flask.
Add a small amount of distilled water to the flask and swirl it to dissolve the phenolphthalein.
Add more distilled water to the flask until the volume reaches the 100mL mark on the neck of the flask. Make sure that the bottom of the meniscus is exactly on the mark.
Cap the flask and invert it several times to ensure that the solution is thoroughly mixed.
The resulting solution is now 0.5% phenolphthalein by mass and can be used as required.
It is important to note that a volumetric flask should be used to prepare this solution because it ensures that the solution is accurately diluted to a known volume. Additionally, distilled water should be used to prepare the solution to prevent any impurities from affecting the accuracy of the solution.
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