# Potasium Hydroxide Lab

Powerful Essays
Data Collection and Data Processing The experiment was on the basis of the concentration of Potassium Hydroxide affecting the temperature of water that it is dissolved in. One person stirred in the different concentrations of Potassium Hydroxide while the other measured the temperature as it rose after the pellets dissolved. At times it was difficult to ensure that the pellets were completely dissolved within the solution.
Raw Data Table: The temperature of water after dissolving different concentrations of Potassium Hydroxide in it.
Concentration of Potassium Hydroxide (g/ml) (±0.01 g/ml)
Uncertainties of Concentration (±g/ml)
Temperature of Water (°C) (±0.2 °C)

Trial 1
Trial 2
Trial 3

Initial
Final
Initial
Final
Initial
Final
0.01
0.0011
18
19
24
24
22
23
0.03
0.0012
24
27
24
26.5
23.5
26
0.05
0.0015
24
29
21
27
22
28
0.07
0.0017
24
31
24
31
24
30
0.09
0.0019
24
34
24
33
24
33

Processed Data Table: The change in temperature of water after dissolving Potassium Hydroxide in it.
Concentration of Potassium Hydroxide (g/ml)
Uncertainties of Concentration (±g/ml) Change in Temperature of Water (°C) (±0.2°C)

Trial 1
Trial 2
Trial3
Average
0.01
0.0011
1
0
1
0.67
0.03
0.0012
3
2.5
2.5
2.67
0.05
0.0015
5
6
6
5.67
0.07
0.0017
7
7
6
6.67
0.09
0.0019
10
9
9
9.33

Calculations
ΔT = 19 – 18 = 1°C

ΔTavg = = 0.67 °C

ΔTunct == ±0.2°C

Observation Table: The qualitative observations taken during the experiment.

Figure 1: Concentration of Potassium Hydroxide vs the Change in Temperature.

Conclusion and Evaluation It is evident at the end of this experiment that the concentration has a significant effect on the change in temperature of water. The hypothesis that an increase in concentration of the Potassium Hydroxide would cause an increase in the change of temperature was proven correct. This is seen with regards to the data. A

## You May Also Find These Documents Helpful

• Better Essays

Standardisation of a Solution of Sodium Hydroxide: Introduction: In a lot of cases it isn’t possible to prepare a solution by accurate weighing of the solute, dissolving in water and diluting to volume. There are many possible reasons for this, but in the case of sodium hydroxide, the solid absorbs moisture from the air, and also reacts with carbon dioxide from the air. In that case, it cannot be accurately weighed in air. In an experiment like this, a solution of the approximate required concentration…

• 1126 Words
• 5 Pages
Better Essays
• Powerful Essays

Experiment 10: Solubility Product for Calcium Hydroxide GOAL AND OVERVIEW A saturated solution of Ca(OH)2 will be made by reacting calcium metal with water, then filtering off the solids: Ca(s) + H2O → Ca(OH)2(s) Ca2+(aq) + 2OH-(aq) The concentration of dissolved hydroxide will be determined by acid-base titration with standardized HCl solution. The Ksp for Ca(OH)2 will be calculated from the experimentally determined saturation concentration of hydroxide. Objectives of the data analysis understand…

• 1626 Words
• 7 Pages
Powerful Essays
• Better Essays

both sides.(1) (3) b Other metal carbonates decompose in a similar way. i Name the solid produced when zinc carbonate decomposes. (1) ii Name the gas produced when copper carbonate decomposes. (1) 4 Farmers can use calcium hydroxide to neutralise soils that are too acidic. Limestone is mainly calcium carbonate, CaCO3. Limestone is used to make…

• 846 Words
• 4 Pages
Better Essays
• Better Essays

Sodium hydroxide, also known as caustic soda,[2][3] or lye, is an inorganic compound with the chemical formula NaOH (also written as NaHO). It is a white solid, and is a highly caustic metallic base and alkali salt. It is available in pellets, flakes, granules, and as a 50% saturated solution.[citation needed] Sodium hydroxide is soluble in water, ethanol and methanol. This alkali is deliquescent and readily absorbs moisture and carbon dioxide in air. Sodium hydroxide is used in many industries…

• 2750 Words
• 11 Pages
Better Essays
• Better Essays

Investigating the solubility of Group II hydroxides Jiyeon Kim Aim: To investigate the solubility of Group II hydroxides (Mg(OH)2, Ca(OH)2, Sr(OH)2, Ba(OH)2) Research Question: What is the trend of solubility of Group II hydroxides going down the group as determined through measuring the volume of hydroxides needed to titrate with a known concentration of hydrochloric acid? Background Information: Solubility is when a solute forms a homogeneous solution by dissolving in solvent. The solubility…

• 1712 Words
• 7 Pages
Better Essays
• Good Essays

OF SODIUM HYDROXIDE Standard solutions for titrations are especially pure mixtures with exactly known concentrations. Primary standards are very pure solids. They have the advantage that they can be weighed (the analytical balance is normally the most accurate instrument in the laboratory) and they are stable under laboratory conditions. In this experiment, the primary standard is oxalic acid dihydrate, H2C2O4 ( 2H2O. It will be used to standardize a solution of sodium hydroxide. Sodium…

• 1024 Words
• 5 Pages
Good Essays
• Better Essays

Potassium Hydroxide (KOH) Introduction Potassium hydroxide is an inorganic compound with the formula KOH, commonly called caustic potash. Along with sodium hydroxide (NaOH), this colorless solid is a prototypical strong base. It has many industrial and niche applications. Most applications exploit its reactivity toward acids and its corrosive nature. In 2005, an estimated 700,000 to 800,000 tonnes were produced. Approximately 100 times more NaOH than KOH is produced annually. KOH is noteworthy…

• 1663 Words
• 7 Pages
Better Essays
• Satisfactory Essays

Jay Patel 10/21/11-10/21/11 Lab Partners: Isha Dihora, Shivandu Patel, Dilan Kapadia Standardizing a Solution of Potassium Hydroxide Abstract: In this lab, a prepared solution of Potassium Hydroxide will be standardized. The solution we will be standardized by performing multiple calculations to ensure the upmost accuracy. The acid used for this titration will be KHP (C4H5KO4). Phenolphthalein we be added to the beaker of the dissolved acid before the titration will be added. The titration…

• 447 Words
• 2 Pages
Satisfactory Essays
• Satisfactory Essays

The solubility of calcium hydroxide Aim: to find out the solubility of a substance that only partially dissolves in water. Method: place about 100cm3 of distilled water in a flask and add about one spatula of solid calcium hydroxide. Stopper the flask and shake well for one minute. Leave to stand for at least 24 hours. Titrate 10cm3 samples against 0.05 mol dm-3 hydrochloric acid solution using methyl orange as an indicator. Obtain enough results to calculate an accurate average, and then…

• 611 Words
• 3 Pages
Satisfactory Essays
• Satisfactory Essays

Thermochemistry Lab #2 - Heat of Reaction - Hess's Law Return The foundation of the study of thermochemistry was laid by the chemist Germain Hess, who investigated heat in chemical reactions during the last century. One statement of the law that bears Hess's name says: The enthalpy change for any reaction depends on the products and reactants and is independent of the pathway or the number of steps between the reactant and product. In this experiment, you will measure and compare…

• 1113 Words
• 5 Pages
Satisfactory Essays