Redox Reactions and Electrochemistry - Medium

25\,\text{mL}

acidified

\mathrm{K_2Cr_2O_7}

solution is diluted to

200\,\text{mL}

. If

40\,\text{mL}

of the diluted solution exactly required

15\,\text{mL}

0.2\,\text{N}

KI solution for titration, the normality of original

\mathrm{K_2Cr_2O_7}

solution is: