Question

Eli states that sodium phosphate is a mixture because it is composed of both sodium ions and phosphate ions.

Which is the best analysis of Eli’s statement?

a. It is correct because each ion is a pure substance, so sodium phosphate is made up of two pure substances.
b. It is correct because the composition of sodium phosphate changes depending on the sample.
c. It is incorrect because sodium phosphate is a compound that has a single composition.
d. It is incorrect because the two types of ions in sodium phosphate cannot be seen.

Answer 1

C is the answer just took the test

Answer 2

Answer is: c. It is incorrect because sodium phosphate is a compound that has a single composition.

Sodium phosphate is chemical compound composed of atoms connected with chemical bonds.

Pure substance is made of only one type of atom (element) or only one type of molecule (compound), it has definite and constant composition with distinct chemical properties.

Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.