Sodium Sulfate and Hydrates Concepts

The video tutorial explains how to write the formula for sodium sulfate decahydrate by breaking it into two parts: sodium sulfate and decahydrate. Sodium sulfate is a neutral compound with a one-plus ionic charge for sodium and a two-minus charge for sulfate, requiring two sodium atoms to balance the charges. Decahydrate indicates the presence of ten water molecules around sodium sulfate, represented by a dot and 10 H2O in the formula. Heating removes the water, leaving anhydrous sodium sulfate.

What is the first step in writing the formula for sodium sulfate decahydrate?

• Determine the ionic charges

• Name the sodium sulfate

• Find the atomic mass of sodium

• Identify the number of water molecules

What is the symbol for sodium on the periodic table?

• SO4

• S

• NA

• H2O

Which of the following is a polyatomic ion?

• O2

• NA

• SO4

• H2O

What is the ionic charge of sodium in sodium sulfate?

• 0

• 1+

• 2+

• 2-

How many sodium atoms are needed to balance the charge of sulfate in sodium sulfate?

• Four

• One

• Three

• Two

What does 'deca' signify in decahydrate?

• Fifteen

• Ten

• Twenty

• Five

How are water molecules represented in the formula for sodium sulfate decahydrate?

• With a minus sign

• With a dot and H2O

• With a plus sign

• As a subscript

What happens to the water molecules in sodium sulfate decahydrate when heated?

• They become part of the compound

• They evaporate

• They increase in number

• They form a solid

What is sodium sulfate called when it does not have water molecules around it?

• Anhydrous sodium sulfate

• Hydrated sodium sulfate

• Sodium sulfate monohydrate

• Sodium sulfate dihydrate

Who is the presenter of the video tutorial?

• Dr. B

• Dr. A

• Dr. D

• Dr. C