A student investigates the reaction between sodium hydroxide solution and dilute sulfuric acid: He does titration to find the concentration of the sulfuric acid: This is his plan for the titration: There are some mistakes and omissions in his plan_ rinse a conical flask with the sodium hydroxide solution use measuring cylinder to measure out 25cm' of the sodium hydroxide solution and add it to the conical flask add a few drops of methyl orange indicator to the conical flask rinse burette with water and then fill it with the sulfuric acid add the acid from the burette to the conical flask until the indicator changes colour at the end-point of the titration record the final burette reading Give the colour change of the methyl orange indicator at the end-point: from (b) Describe four changes that the student could make to improve his plan.