Because we're asked to calculate the molarity of nickel(II) cation, we need to determine all sources for that species, in this case, all Ni⁺² comes from the nickel(II) bromide solid (NiBr₂).

We use the molecular weight of NiBr₂ to calculate the moles of Ni:

1.87 g NiBr₂ ÷ 218.49g/mol * (1molNi⁺²/1molNiBr₂) = 8.55x10⁻³ mol Ni⁺²

Then we divide the moles by the volume in order to calculate the concentration:

8.55x10⁻³ mol Ni⁺² / 0.200 L = 0.0428 M

7 0

2 years ago

8. The best way to obtain pure, solid household salt from a solid mixture of household salt and sand is to:

dedylja [7]

The best way to obtain pure, solid household salt from a solid mixture of household salt and sand is to "add water, stir, filter and evaporate the filtrate".

Option: C

Explanation:

The salt and sand can be separated on the basis of solubility, as we know the salt is chemically known as sodium chloride, which have good solubility in water. The most general method is the mixture is taken into a flask or beaker and water is added with stirring, where salt get dissolved and sand remain as it is, because NaCl is capable enough to form hydrogen bonding with water, while sand have absence of such property. Then this solution containing insoluble sand is filtered by using filter paper. The sand is received in filter paper while filtrate in beaker is evaporated by boiling it in order to receive salt as residue.

8 0

3 years ago

All of the following are examples of suspensions except what?:

artcher [175]

Dust particles in the air

6 0

2 years ago

Hormones that are essential for normal body growth and maturation include all the following except￼￼?

Hormones that are essential for normal body growth and maturation include all the following except?