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A student uses gravimetric determination to find the water of hydration of a hydrated sample of cobalt (II) sulfate. The student’s sample contained 0.0098459 moles of anhydrous cobalt(II) sulfate (CoSO4) and 0.068921 moles of water (H2O). What is the formula of the cobalt(II) sulfate hydrate? (1 point)

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Answer:

CoSOâ‚„.7Hâ‚‚O

Explanation:

Some salts are in its hydrate form to stabilize them. The hydrated form of CoSOâ‚„ is:

CoSOâ‚„.XHâ‚‚O

To find the hydration of the COSOâ‚„ you must find the ratio of Hâ‚‚O and CoSOâ‚„ that is:

0.068921 moles Hâ‚‚O / 0.0098459 moles CoSOâ‚„ = 7

That means you have 7 moles of water per mol of CoSOâ‚„ and the formula is:

CoSOâ‚„.7Hâ‚‚O

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