6th Edition, Problem 3.25

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kevinav
Posts: 32
Joined: Fri Sep 28, 2018 12:16 am

6th Edition, Problem 3.25

Postby kevinav » Tue Oct 30, 2018 8:39 pm

The problem is the following:
3.25 On the basis of the expected charges on the monatomic ions, give the chemical formula of each of the following compounds: (a) magnesium arsenide; (b) indium(III) sulfide;
(c) aluminum hydride; (d) hydrogen telluride; (e) bismuth(III) fluoride.

What do the roman numerals after some of the elements mean?

jguiman4H
Posts: 31
Joined: Fri Sep 28, 2018 12:29 am

Re: 6th Edition, Problem 3.25

Postby jguiman4H » Tue Oct 30, 2018 8:47 pm

The roman numerals after these elements indicate the ion being used. Because the element given has a roman numeral after it, you know it has multiple ions (i.e. Fe2+ and Fe3+ could be iron(II) and iron (III).

For example, indium (III) sulfide will form In2S3 from In3+ and S2-. Thus, you know indium has multiple ions; the book is just telling you to use the 3+ version for this compound. Hope this helps!


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