Balanced equations

student rinse burette with deionised water before filling with sodium hydroxide solution

state and explain the effect that this rinsing will have on the value of the titre

This would dilute the NaOH that you add

so the titre value would be larger

importance of percentage yield

getting as much product as possible in the reaction

importance of percentage atom economy

minimising the amount of by products

maximising the mass of reactants

Why this air bubble increases the final burette reading of the rough titration

Air bubbles take up volume that would be filled by solution

the student washed the inside of the conical flask with some distilled water

suggest why this washing does not give an incorrect result

does not change the number of moles of alkali

reducing agent

electron donor

two ways that the student could reduce the percentage uncertainty in the measurement of the volume of sodium thiosulfate solution, using the same apparatus as this experiment

Use more of the alloy

use a lower concentration of the thiosulfate solution

role of iodine in the reaction with sodium thiosulfate

oxidising agent

copper (II) ion electronic configuration

1s2 2s2 2p6 3s2 3p6 3d9

copper(l) iodide is a white solid

explain why copper(l) iodide is white

full 3d subshell

cannot absorb visible/ white light