Suppose that a student doing this experiment ran into some procedural and calculation difficulties. state the effect each of the following would have on the calculated value of r determined from this experiment. briefly explain. (1) after the reaction was completed, the student failed to withdraw the rod to its original position before taking the second buret reading. (2) the student neglected to take into account the pressure of water vapor in the system when doing the calculations. (3) the hydrogen peroxide solution had decomposed slightly after standing for a while, so its concentration

1.- The volume will be incorrect.

2.- The volume will be incorrect.

3.-  will decrease.

Explanation:

1.- If the rod is not in the correct position, the volume inside the buret will continue to leak, so the reading of the volume that is suppose to be show the equilibrium will be incorrect.

2.- The pressure of water vapor will be different depending the environmental pressure, in this way, if the student do not check either the temperature or the pressure, the calculations will be different, because the liquids behave different at different temperatures.

3.- If a substance get decomposed after a while, the concentration starts to decrease, this is important for some processes like doing hair dyes, in which the amount of hydrogen peroxide is to important.

Hope this info is useful

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

the dissolution of polymer can be thermodynamically described in 2 steps.