CHEMISTRY LAB SK025 2019/2020 NAME: MATRIC NO.: PRACTICUM: DATE: EXPERIMENT 1 : Rate of Reaction OBJECTIVE : __________________________________________________ __________________________________________________ RESULTS & CALCULATIONS: A) EFFECT OF CONCENTRATION ON THE REACTION RATE Volume of 0.10M Na2S2O3 (ml) Volume of distilled water (ml) [Na2S2O3] (M) Time taken, t (s) × − (s-1 ) Example of calculation of [Na2S2O3] after dilution: 2 23 = 2 23 = ()() = () ∴ = ______________
CHEMISTRY LAB SK025 GRAPH 1: × − (s-1 ) versus [Na2S2O3] (M):
CHEMISTRY LAB SK025 Based on GRAPH 1, it can be concluded that: 1. ______________________________________________________________ ______________________________________________________________ 2. ______________________________________________________________ ______________________________________________________________ B) EFFECT OF TEMPERATURE AND CATALYST ON THE REACTION RATE Temperature (°C) Time for colour of solution to disappear (s) × − (s-1 ) Without the addition of catalyst, MnSO4 (A1 + B1) With the addition of catalyst, MnSO4 (A2 + B2) Without the addition of catalyst, MnSO4 (A1 + B1) With the addition of catalyst, MnSO4 (A2 + B2)
CHEMISTRY LAB SK025 GRAPH 2: × − (s-1 ) versus temperature (°C):
CHEMISTRY LAB SK025 Based on GRAPH 2, it can be concluded that: 1 is __________________________ to temperature. The rate of reaction is __________________________ to temperature. Gradient of graph with catalyst is _________________ compared to that without catalyst. The presence of catalyst ___________________ the rate of reaction. DISCUSSIONS: 1. Write the equation of the reaction for: A) EFFECT OF CONCENTRATION ON THE REACTION RATE: B) EFFECT OF TEMPERATURE AND CATALYST ON THE REACTION RATE: 2. Give TWO sources of experimental errors: I. _________________________________________________________ _________________________________________________________ II. _________________________________________________________ _________________________________________________________ CONCLUSIONS: I. ______________________________________________________________ ______________________________________________________________ II. ______________________________________________________________ ______________________________________________________________
CHEMISTRY LAB SK025 EXERCISES: I. What is the function of catalyst in experiment B? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ II. 1 represents the ______________________________________________.