The double-stranded silicate ion shown in the picture below combines with calcium and magnesium to form the mineral tremolite,which is a form of asbestos.What is the formula and charge of the repeating unit of the silicate ion?

Question

Quizplus · Accepted Answer

The repeating unit of the silicate ion can be determined by counting the number of silicon atoms and oxygen atoms in the structure. In this case, there is one silicon atom and four oxygen atoms, which gives a basic formula of SiO4. However, the silicate ion has a charge of 4- due to the presence of extra electrons, so the complete formula of the repeating unit is SiO4^4-. Choice B is the only option that includes this repeating unit in its structure, with additional ions such as Ca2+ and Mg2+ to form tremolite.

The Double-Stranded Silicate Ion Shown in the Picture Below Combines