Αποτελέσματα Αναζήτησης
29 Σεπ 2024 · Hydrated and anhydrous salts. Hydrated salts are salts that contain water of crystallisation which affects their molecular shape and colour. Water of crystallisation is the water that is stoichiometrically included in the structure of some salts during the crystallisation process. One example is copper(II) sulfate:
Formula of a Hydrate (\(\text{Anhydrous Solid}\ce{*}x\ce{H2O}\)) The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid.
We can find the percent of water in a hydrate experimentally by accurately determining the mass of the hydrate and the mass of the anhydrous salt. The difference in mass is due to the water lost by the hydrate.
We can use difference in the mass between the hydrated and anhydrous compound to calculate the mass of water of crystallisation removed by heating.
After heating, the mass of the anhydrous compound is found to be 3.22 g. Determine the formula of the hydrate and then write out the name of the hydrate. Solution: 1) Determine mass of water driven off: 4.31 − 3.22 = 1.09 g of water. 2) Determine moles of Na 2 CO 3 and water: Na 2 CO 3---> 3.22 g / 105.988 g/mol = 0.0304 mol
. We can use difference in the mass between the hydrated and anhydrous compound to calculate the mass of water of crystallisation removed by heating. Heat to constant mass to ensure all of...
(a) What was the mass of the anhydrous salt? (b) How many moles of anhydrous salt is this? (c) What was the mass of the water driven off? (d) How many moles of water is this? (e) Determine the mole ratio of water : anhydrous form. (f) What is the fomula of this hydrate? Not sure what a crucible looks like? Here is a photo. It's held by a clay ...
