Enthalpy change, Chemistry

Question: Does the number of steps in a reaction process affect the enthalpy change of the overall reaction?

Hypothesis:

To compare experimental data to functionality of Hess's Law.

Procedure:

Part A:

1. Write the reaction for the dissociation of solid sodium hydroxide in water.

2. Get a coffee cup calorimeter, tare the electronic scale, and weight the calorimeter. Record.

3. Add approximately 100.0mL of distilled water to the cup.

4. Re-weigh the cup to determine the volume of water. Record.

5. Obtain a small piece of aluminum foil, place it on the scale, and tare the scale.

6. Weigh out approximately 1.00g of NaOH pellets. (USE EXTREME CAUTION! Re-cap the bottle!) Record.

7. Measure the temperature (to TWO decimal places) of water in the cup. Record.

8. Add the pre-weighed NaOH pellets to the calorimeter with water, cap it, stir the contents, and measure the temperature (to TWO decimal places) every 15 seconds for 2 minutes (or more, as needed until temperature stops increasing). Record.

9. Clean up.

Part B:

1. Write the equation for reaction between aqueous sodium hydroxide and aqueous hydrochloric acid.

2. Using the designated graduated cylinders, obtain 50.0mL of each of 0.500M NaOH(aq) and0.500M HCl(aq). Record.

3. Measure the temperature (to TWO decimal places) of both solutions. Record.

4. Mix the two materials into a coffee cup calorimeter, cap it, stir the contents, and measure the temperature (to TWO decimal places) every 15 seconds for 2 minutes (or more, as needed until temperature stops increasing). Record.

5. Clean up.

Part C:

1. Write the equation for the reaction between solid sodium hydroxide and aqueous hydrochloric acid.

2. Get a coffee cup calorimeter, tare the electronic scale, and weight the calorimeter. Record.

Posted Date: 2/22/2013 12:30:15 AM | Location : United States







Related Discussions:- Enthalpy change, Assignment Help, Ask Question on Enthalpy change, Get Answer, Expert's Help, Enthalpy change Discussions

Write discussion on Enthalpy change
Your posts are moderated
Related Questions
Which one is not the correct relation in the following: (1)  h= E/ v                           (2) E= mc 2             (3) Δ x × p = h/ 4 Π                      (d) γ

Acyclic or open-chain compounds Organic compounds where all types of the carbon atoms are associated to one another to form open chains (straight or branched) are known as acyc

(i) Assign appropriate reason for each of observations: (a) Anhydrous ALCI is used as a catalyst. (b) Phosphinic acid behaves as a monoprotic acid. (c) SF6 is not easily h

sometimes we put a coordinate bond or sometimes we put a double bond in between s and a nonprotonated o atom in the structure of h2so4.is there any diifference in between these two

Major modes of food deterioration During storage and distribution, foods are exposed to a wide range of environmental conditions. Environmental factors such as temperature, hum

Direction of the shift of electron pair The direction of the shift of electron pair can be decided on the basis of subsequent points. (i) While the sets related to a multipl

formula mass of hemoglobin

application of crystallography

Which of the following statements does not form part of Bohr's model of the hydrogen atom: (1) Energy of the electrons in the orbit is quantized (2) The electron in the orbi