# How Much Sodium Is Required to Produce 8g of Sodium Hydroxide?

• ignacioserra
In summary, Sodium reacts in water to form sodium hydroxide and hydrogen gas. To prepare 8 grams of sodium hydroxide, 40 grams of sodium hydroxide must be used.
ignacioserra
Hello!
Can somebody help to figure out this pls?

Sodium reacts in water to form sodium hydroxide and hydrogen gas. Write a balanced equation for this reaction and calculate how many grams of it are needed to prepare 8 g of sodium hydroxide by this method.
Ar(H)=1 Ar(O)=16 Ar(Na)=23

Balanced equation:
2 Na + 2 H2O --- 2 NaOH + H2

Sodium hydroxide mass: 40 g
I could easily figure out the balanced equation, but I don't know how to do the rest.
Thx!

ignacioserra said:
Hello!
Can somebody help to figure out this please?

Sodium reacts in water to form sodium hydroxide and hydrogen gas. Write a balanced equation for this reaction and calculate how many grams of it are needed to prepare 8 g of sodium hydroxide by this method.
Ar(H)=1 Ar(O)=16 Ar(Na)=23

Balanced equation:
2 Na + 2 H2O --- 2 NaOH + H2

Sodium hydroxide mass: 40 g
I could easily figure out the balanced equation, but I don't know how to do the rest.
Thanks!

Hint :What do you get from equation ? Can you express mass of NaOH and Na in gram molecular mass in the equation ?

From equation what can you say ? How many mass of Na can prepare how many mass of NaOH in gram molecular mass ? Apply unitary method...

ignacioserra said:
2 Na + 2 H2O --- 2 NaOH + H2

It tells you: two moles of Na react with two moles of water yielding two moles of NaOH and one mole of hydrogen gas.

Ratio of the reactants and products always stays the same (assuming there is enough other reactants present). In this case ratio of Na to NaOH is 1:1 (which is equivalent to 2:2). 2 moles of Na produce 2 moles of NaOH. 1 mole of Na produces 1 mole of NaOH. 10 moles of Na produce 10 moles of Na. 0.0000000001 mole of Na produces 0.0000000001 mole of NaOH.

It also works the other way. If 2 moles of NaOH were produced, there were 2 moles of Na. If 0.4 moles of NaOH were produced, there were 0.4 moles of Na present.

Now all you need it to convert given mass to moles, convert 8 grams of NaOH to moles, find out how many moles of Na were needed, and convert it to Na mass.

So:
NaOH= 16+23+1= 40
Na= 23

23g of Na produce 40 g of NaOH. Right?

So,

23 --- 40
x --- 8 ?

40/5 = 8
23/5= 4.6 g

ignacioserra said:
So:
NaOH= 16+23+1= 40
Na= 23

23g of Na produce 40 g of NaOH. Right?

So,

23 --- 40
x --- 8 ?

40/5 = 8
23/5= 4.6 g

Well done !

Note : Here 2 moles of NaOH are produced from 2 moles of Na. Ultimately 2 and 2 on both sides canceled , so your answer remained unaffected.

For future reference :
http://www.sciencebugz.com/chemistry/chsolstoich.htm
http://www.sciencegeek.net/Chemistry/taters/Unit4Stoichiometry.htm

## 1. What happens when sodium reacts with water?

When sodium reacts with water, it produces sodium hydroxide (NaOH) and hydrogen gas (H2). This reaction is exothermic, meaning it releases heat energy.

## 2. Is sodium reactive?

Yes, sodium is highly reactive and is classified as an alkali metal. It reacts vigorously with water and other substances such as oxygen and halogens.

## 3. What safety precautions should be taken when working with sodium?

Sodium should be handled with caution as it is a highly reactive substance. Proper personal protective equipment, such as gloves and goggles, should be worn at all times. It should also be stored in a dry, cool place and kept away from water and other reactive substances.

## 4. How does sodium react with acids?

Sodium reacts with acids to produce a salt and hydrogen gas. The reaction is similar to when sodium reacts with water, but it is less vigorous. The resulting salt will depend on the type of acid used.

## 5. Can sodium react with other elements?

Yes, sodium can react with other elements to form various compounds. For example, it can react with chlorine to form sodium chloride (table salt) or with oxygen to form sodium oxide. It can also form alloys with other metals, such as sodium-potassium alloy.

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