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
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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
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Chemical Reactions- Sodium Hydroxide A chemical reaction is a change where two or more substances are changed into a new substance. You can identify a chemical reaction by colour change‚ effervescence (bubbles)‚ when light or heat given off‚ and the change is usually irreversible. There are 6 main types of chemical reactions- combustion (often called burning)‚ synthesis‚ decomposition‚ neutralization‚ single replacement and double replacement. A combustion reaction is a reaction with oxygen‚ and
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Experiment 1: Study of Solubility Equilibrium Data Treatment and Analysis Section 1: Solubility Product Constant Temperature (˚C) | Volume of NaOH used (mL) | | | | Titration 1 | Titration 2 | Average | 28 | 12.7 | 12.8 | 12.75 | 9 | 10.5 | 10.5 | 10.5 | 19 | 11.3 | 11.2 | 11.25 | 40 | 16.2 | 16.2 | 16.2 | 50 | 22.8 | 22.9 | 22.85 | Table 1: The volume of NaOH used in the titration at various temperatures. No. of moles of KHC4H4O6 = 1.45 g ÷ 188.177g/mol = 7.71 x 10-3mol
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Calcium is one of the most abundant element in the earth’s crust at number 5. Calcium has a very high chemical reactivity so it is never found as an uncombined state in nature. It is a silvery-white metal and it is in the alkaline earth family. Calcium is needed for blood clotting and controlling cell responses in nerves and muscles.Ninety-nine percent of the calcium in the human body is in our bones and teeth. Bone tissues are renewing themselves constantly and to do that they have to build new
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Determination is a positive emotion that involves persevering towards a difficult goal in spite of obstacles.[1][2] Determination occurs prior to goal attainment and serves to motivate behavior that will help achieve one’s goal. Empirical research suggests that people consider determination to be an emotion; in other words‚ determination is not just a cognitive state‚ but rather an affective state.[3] In the psychology literature‚ researchers have studied determination under other terms‚ including
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such a way that it can be discarded through its ability to act as an emulsifying agent. This emulsifying agent enables the dispersion of liquid into another immiscible liquid. In this manner‚ oil does not mix with water whereby able to induce dirt. 2. Raw materials and soap making Soap making requires two major raw materials: * Fats and oils Fats and oils are esters of fatty acids and glycerol. These are obtained from natural substances which are classified into three: a. Nut oils Cold
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equal each other. At this point‚ the concentrations do not change with time. These reactions are said to be in equilibrium. Equilibrium is depended on a particular temperature‚ and the concentrations of reactants and products have to follow a rule demonstrated by the equilibrium constant Kc. The equilibrium concentrations that will be studied is the reaction between iron (III) ion and thiocyanate ion: The mixture of Fe3+ and SCN- react to form a compound that produces a dark brown/red color. Since
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(3) 30 grams of NaCl in 100 grams of water (2) 12 grams of KClO3 in 200 grams of water (4) 30 grams of NaCl in 200 grams of water Answer--> Choice 1 8/02 One hundred grams of water is saturated with NH4Cl at 50oC. According to Table G‚ if the temperature is lowered to 10oC‚ what is the total amount of NH4Cl that will precipitate? (1) 5.0 g (2) 17 g (3) 30. g (4) 50. g Answer--> Choice 3; 52g-32g=30g 1/03 1 Solubility data for four different salts in water at 60oC
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standardize a Sodium Hydroxide (NaOH) solution by titrating it with pure sample of Potassium acid Phthalate (KHC8H4O4). This experiment has two sections. The first section is to standardize the Sodium Hydroxide by titration. Three sample of 0.7 – 0.9 g of solid KHP are place into each of the three numbered Erlenmeyer flasks. 50 ml of distilled water are added to each three of it from graduated cylinder and constantly shake it until the KHP solution are completely dissolve. 2 drops of phenolphthalein
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