# six. 03 Calorimtery Honors

The Dissolving of Solid Sodium Hydroxide in Water

Treatment:

1 . Measure out approximately two hundred mL of distilled drinking water and put it in to the calorimeter. Blend carefully having a thermometer right up until a constant temperatures is reached. Record the volume of drinking water and the continuous initial heat of the water on your data table. installment payments on your Place a plastic-type material measuring trough on top of the digital harmony, and then zero the balance (press the tare button) in order that the mass in the trough will be " ignored" and will not be put into the total mass measured by balance. a few. Measure away approximately three to five scoops of solid sodium hydroxide and record the mass to your data table. 4. Put the solid sodium hydroxide in to the water inside the calorimeter and replace the lid immediately. Stir lightly until the solid is completely blended and record the highest heat reached. Info and Observations:

CALORIMETRY RESEARCH LABORATORY

PART ONE|

Frequent initial temperature| 24. five degrees C

NaOH mass| 2 . 535g

Final temperature| 27. eight degrees C

PART TWO|

HCL solution| 105ml

NaOH solution| 105ml

Primary HCL temperature| 25. a couple of degrees C

Mixed solution temperature| twenty eight. 2 certifications C

Inside the lab, it had been hard to get the measurements of the liquids precise, so they each were 5ml over what was asked for.

Calculations:

Show your work and write a short explanation with each computation. 1 . Create a balanced " equation" to get the process you investigated simply I, which includes phase signs.

NaOH(s) --> Na+(aq) & OH-(aq)

installment payments on your Calculate the number of moles of sodium hydroxide dissolved. Captivate work. Skin moles of NaOH = installment payments on your 535 grams

NaOH X (1 mol/40. 00 grams) =

0. 06338 skin moles NaOH

a few. Calculate how much energy involved with this dissipating process. Captivate work.

205 g H2O

c = 4. 184 J/gC

T2 = twenty seven. 8 C

T1 sama dengan 24. a few C

Heat gained by simply H2O sama dengan 205 g X four. 18 J/gC X (27. 8 - 24. 5)

= 2827. 77 J

4....