You are provided with the following apparatus

- Two beakers.
- A complete retold stand.
- Funnel
- Cotton wool.
- Access to water.
- Stop watch.
- A burette with a tap (50cm
^{3}). - 100ml measuring cylinder.

Proceed as follows:

- Set the apparatus as follows:
- Support the burrete on a result as shown above
- Close the tap of the burrete and fill it with water to the brim
- Transfer the water to the 100ml measuring cylinder and record the volume of the water

Volume V_{1 }=**65cm**(1mk)^{3}

- Fill the burrette with water up to the 0cm
^{3}mark. Drain this water into 100ml measuring cylinder and record its volume V_{2}V_{2}=**53 cm**(1mk)^{3}

The excess water above the zero mark is given by

V_{0}= V_{1 }– V_{2}V_{0}=**65 − 53 = 12 cm**(1mk)^{3}

(This volume should be added to the final volume of the burette reading when water has been drained) - Fill the burrete with water to the brim. Finally open the tap at once and start the stop watch simultaneously. Obtain the time, t taken for the level of water to reach X=10cm
^{3}Volume drained = (V_{0}+10) cm^{3}

Refill the burette with water. Finally open the tap at once and start the stopwatch simultaneously. Obtain the time taken for the level of water to reach x = 20cm^{3}Volume drained = (V_{0}+20) cm^{3} - Repeat the procedure for other values of the burette readings.

Record the volume drained and the corresponding time in the table below.

(9marks)Burette Reading X (cm ^{3})Volume of water drained

v = (Vo + x)cm^{3}Time t(s) Log _{10}V10 **22****15.90****1.3424**20 **32****23.29****1.5051**30 **42****33.15****1.6232**40 **52****44.12****1.7160**45 **57****49.50****1.7559**50 **62****59.28****1.7924**- Plot the graph of log
_{10}v (vertical axis) against time t. (5mks)

Slope =^{(}^{1.88 − 1.3)}/_{(64 − 0)}

=^{0.58}/_{64}= 0.009 s^{-1} - Using your graph, calculate the value for b and n from the equation. (3mark)

Log_{10}_{V}=^{ 4.2t}/_{b}+ n

- Plot the graph of log