That involves adding 20ml of persulfate and 10 ml Iodine with 10ml thiosulfate ... A reaction ( Rxn) occurs in the 50 ml mixture and all the thiosulfate was consumed in a given time ( 97sec) indicated by the starch turning blue ...
The lab instructions asks me to calculate the reaction rate ( initial rate) but i have trouble understanding what the instruction is asking me to do .. Can someone show me ( visually) how to perform this reaction rate calculation ?
Thank You
le08rd the temperature of the reaction solution. Data Analysis and Calculations. cat Calculating the Reaction Rate. Remember, the starch turns blue when all the thiosulfate has been consumed. To calculate the reaction rate (the initial rate) for each trial: 1. Calculate the initial moles ofthiosulfate S measured time interval. 2. Based on the molesof thiosulfate consumed use the stoichiometric relations from reactions #1 and #2 on the first page) to figure out how many moles ofpersulfate (S2082) are consumed in reaction #1 during the same time interval. This is the change in moles of persulfate during the reaction. 3. Since the rate of the reaction is defined as the negative of the change in molarity of persulfate per time, calculate the reaction rate by dividing the change in moles of persulfate by the volume of the reaction solution and dividing by the time (in seconds). The formula is: initial moles of thiosulfate (S.0 803 s). This is the amount consumed in reaction #2 in the rate--afs,og]-moles ofs,of consumed time (in seconds, The formula is: 0.005 M of ,0 initial,,-)0.000M of-272 㢠Tme9 rate»-Î|s,08-= moles of S202-consumed initial seC At Lof reaction solution time molart Note: In this calculation we are assuming that the rate stays essentially constant during the measured time. This is a reasonable assumption since we are only running the reaction for a short period of time, so the [S2O and the [r] don't change very much compared to their initial values
