How do you do the question: react 3.50 g of solid sodium metal with water to produce hydrogen gas and sodium hydroxide. If,at the end of the reaction there is 6.8 L of solution, what is the concentration of sodium hydroxide?
This is realy quite urgent. I need to know for my class's in 40 minutes.
You're on a tight schedule. Most of the times we don't get the answers out that fast.
2Na + 2H2O ==> 2NaOH + H2
mols Na = grams/molar mass = ?
M NaOH = mols NaOH/6.8 L = ?
To determine the concentration of sodium hydroxide in the solution, we need to first calculate the number of moles of sodium hydroxide produced.
Here's how you can do that:
1. Start by writing a balanced chemical equation for the reaction between sodium metal (Na) and water (H2O):
2Na + 2H2O -> 2NaOH + H2
According to the balanced equation, 2 moles of sodium metal reacts with 2 moles of water to produce 2 moles of sodium hydroxide and 1 mole of hydrogen gas.
2. Determine the number of moles of sodium hydroxide produced:
To calculate the number of moles of sodium hydroxide, we need to know the molar mass of NaOH.
The molar mass of sodium (Na) is approximately 22.99 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol, and the molar mass of hydrogen (H) is approximately 1.01 g/mol.
The molar mass of sodium hydroxide (NaOH) can be calculated as:
Na (22.99 g/mol) + O (16.00 g/mol) + H (1.01 g/mol) = 39.00 g/mol
Now, we can calculate the number of moles of sodium hydroxide:
moles of NaOH = mass of NaOH / molar mass of NaOH
moles of NaOH = 3.50 g / 39.00 g/mol
3. Next, calculate the concentration of sodium hydroxide:
Concentration is defined as the number of moles of solute (in this case, NaOH) divided by the volume of the solution (6.8 L).
Concentration of NaOH = moles of NaOH / volume of solution
Substituting the values we have:
Concentration of NaOH = (3.50 g / 39.00 g/mol) / 6.8 L
Now, calculate the final concentration value to get the answer.
Please Note: Make sure to use the correct units (grams, moles, liters, etc.) in your calculations, and ensure that all values are consistent.
Hope this helps, and good luck with your class!