The student writes their method.

• A Run the dilute hydrochloric acid into the sodium hydroxide solution while swirling the conical flask.
• B Stop adding the dilute hydrochloric acid when the indicator just changes colour.
• C Use a pipette filler to fill a glass pipette with $25.0{cm}^3$ of sodium hydroxide solution.
• D Add a few drops of methyl orange indicator.
• E Empty the sodium hydroxide solution from the pipette into a conical flask.
• F Fill the burette with dilute hydrochloric acid. Record the initial reading on the burette.
• G Repeat these steps until you have two concordant results.

The steps in the method are not in the correct order.

Arrange the letters to show the correct order of the steps. The first and last steps have been filled in for you:

$F\to \underline{}\to \underline{}\to \underline{}\to \underline{}\to \underline{}\to G$

This is the equation for the reaction in the experiment:

$NaOH+HCl\to NaCl+H_{2}O$

What type of reaction is this?

• Precipitation
• Neutralisation
• Reduction
• Thermal decomposition

This is the equation for the reaction in the experiment:

$NaOH+HCl\to NaCl+H_{2}O$

Water is a waste product in this reaction.

Calculate the atom economy for the production of sodium chloride ($NaCl$).

Relative atomic mass ($A_r$): $H=1.0$, $O=16.0$, $Na=23.0$, $Cl=35.5$