Ia 18

 Ia 14 Essay

Chemistry Investigation 14:

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To look for the enthalpy alter of response for:

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Na2CO3(aq) + H2O(l) & CO2(g) → 2NaHCO3(aq)

Provided:

S1— Anhydrous salt carbonate (Na2CO3)

S2— Desert sodium hydrogen carbonate (NaHCO3)

A1—Aqueous sulfuric acid (H2SO4), 0. 500mol dm-3

Apparatus| Uncertainty

Testing cylinder| ± 0. five ml

Electronic digital Balance| ± 0. 001 g

Data logger| ±0. 2 ℃

Data Collection:

S1

Excess weight of S1

(Weight of weighing bottle & S1 ±0. 001)/g| 4. 583

(Weight of considering bottle ±0. 001) /g| 3. 459

(Weight of S1 ±0. 002)/g| 1 . 124

(Weight of remains & evaluating bottle ±0. 001)/g| three or more. 461| (Actual weight of S1 moved ±0. 002)/g| 1 . 122

Temperature alter

(Temperature just before S1 added±0. 2)/ ℃| 24. zero

(Temperature following S1 added±0. 2)/ ℃| 27. 7

(Temperature increase±0. 4)/ ℃| 3. six

Observation:

The white dust completely dissolves in the option and the remedy remains without color.

S2

Fat of S2

(Weight of weighing & S2 ±0. 001)/g| five. 268

(Weight of weighing ±0. 001) /g| 3. 460

(Weight of S2±0. 002)/g| 1 ) 808

(Weight of residue & weighing bottle±0. 001)/g| three or more. 462| (Actual weight of S2 transferred±0. 002)/g| 1 ) 806

Temperatures change

(Temperature before S2 added±0. 2)/ ℃| 23. 0

(Temperature after S2 added±0. 2)/ ℃| nineteen. 3

(Temperature decrease±0. 4)/ ℃| a few. 3

Declaration:

The white powder completely dissolves inside the solution as well as the solution is still colorles.

Info Processing:

S1

Na2CO3(s) & H2SO4(aq) → Na2SO4(aq) + H2O(l) + CO2(g)

Calculationn(H2SO4)=25. 01000×0. 500=0. 0125moln(Na2CO3)=1. 12222. 99×2+12. 01+16×3=0. 010586molSince n(Na2CO3)