A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate (with the fillers removed). The solid calcium carbonate was collected on a watch glass that had a mass of 46.719 g when empty. After the calcium carbonate had been allowed to dry, the mass of the watch glass plus product was found to be 47.623
1. What is the mass of pure calcium carbonate product collected at the end of the experiment?
2. Calculate the mass % of calcium carbonate in the tablet.
See 6:36pm post by Sam.
To calculate the mass of pure calcium carbonate product collected at the end of the experiment, we need to find the difference in mass before and after drying.
1. The initial mass of the watch glass (empty) is 46.719 g.
2. The final mass of the watch glass plus product is 47.623 g.
3. The mass of the pure calcium carbonate product collected is then:
Mass of watch glass + product - Mass of watch glass
= 47.623 g - 46.719 g
= 0.904 g
Therefore, the mass of the pure calcium carbonate product collected is 0.904 g.
To calculate the mass % of calcium carbonate in the tablet, we need to consider the initial mass of the tablet before it was dissolved.
Given that the mass of the tablet was 1.631 g, and the mass of the pure calcium carbonate product collected is 0.904 g:
2. The mass % of calcium carbonate is calculated as:
(Mass of calcium carbonate / Mass of tablet) x 100%
= (0.904 g / 1.631 g) x 100%
= 55.47%
Therefore, the mass % of calcium carbonate in the tablet is 55.47%.
To answer these questions, we need to perform some calculations based on the given information. Here's how we can approach each question:
1. What is the mass of pure calcium carbonate product collected at the end of the experiment?
To find the mass of pure calcium carbonate product, we need to calculate the mass difference before and after the experiment.
- Start by subtracting the mass of the empty watch glass (46.719 g) from the final mass (47.623 g). This will give us the mass of the product alone.
- The resulting value represents the mass of the calcium carbonate product collected at the end of the experiment.
2. Calculate the mass % of calcium carbonate in the tablet.
To find the mass percentage of calcium carbonate in the tablet, we need to compare the mass of pure calcium carbonate with the initial mass of the tablet.
- Start by subtracting the mass of the fillers from the initial mass of the tablet. We can assume that the initial mass is the mass of the tablet before the experiment (1.631 g) minus the mass of the fillers (since they were filtered out, their mass doesn't contribute to the calcium carbonate).
- Divide the mass of the pure calcium carbonate product (found in question 1) by the initial mass of the tablet and multiply by 100 to convert into a percentage.
- The resulting value represents the mass percentage of calcium carbonate in the tablet.
By following these steps, you should be able to find the answers to both questions.