1. Mg, Na reactions with Water

Which of sodium and magnesium is more reactive? Why?

• Sodium

• When sodium reacts, it loses 1 electron to make Na +1, when mg reacts it makes a +2 ion.

• It takes less energy to lose one electron than it does to lose two.

How vigorous is sodium reacting with water?

Highly vigorous

List things you can see with sodium reacting with water:

• molten ball forming on surface

• fizzing, producing H2 gas.

Write the symbol equation for Na reacting with cold water.

Is the sodium hydroxide produced a strong alkaline? show the pH range.

• Yes, strongly alkaline.

• pH (12-14)

How vigorous is Mg reacting with water?

• Not very vigorous

• It reacts very slowly with water

What can you see with Mg reacting with cold water?

Nothing

Is magnesium hydroxide a weak or strong alkaline?

pH range

• Weak alkaline solution

• pH 9-10

Write the symbol equation for Mg with cold water.

Why is magnesium hydroxide weakly alkaline?

magnesium hydroxide is not very soluble in water, so relatively few hydroxide ions are produced.

Does magnesium react faster or slower with steam?

Faster

Write the symbol equation of Mg with steam.