Biology- Change in pH Aim: To investigate the affect that change in pH levels has on a particular enzyme‚ in this case amylase. Hypothesis: In this investigation I expect as the pH reaches the optimum level‚ the rate of reaction will be fastest‚ compared to other pH levels. It is also suspected that after the enzyme has reached optimum level the enzyme activity will decrease. Through further study of the optimum level of amylase I found that the enzyme usually has an optima pH of 8. It is known
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* Measure respiration rate using different substrates. * Measure respiration rate at different temperature. Introduction: In this laboratory experiment‚ we are given 3 task. The first one is respiration in yeast. Second is respiratory indicator and the third one is observing mitochondria in yeast/onion cell. The first experiment is about investigation of sugars yeast. We will determine which sugars yeast can be use for cell respiration. When the yeast undergoes anaerobic/aerobic respiration
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is the indicator phenolphthalein in an acidic solution and in a basic solution? (2 K/U) Phenolphthalein is colourless in acidic solutions and pinkish in basic solutions. 2) Why does the clear colour‚ which forms at the point where the hydrochloric acid comes into contact with the solution containing phenolphthalein and base in the receiving flask‚ disappear more slowly near the endpoint? (2I) At the start of the titration‚ the NaOH solution in the flask will be pinkish and the pH is quite
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each region to the pH results obtained. - There are four significant regions in each titration curve‚ namely the initial‚ pre-equivalence‚ equivalence‚ and post-equivalence points. These points are named according to its position relative to the equivalence point. The equivalence point signifies the volume of titrant at which the solution becomes neutral. This is represented in the graph as the drastic change in pH‚ first with a sudden increase and a sudden decrease of pH. At the initial point
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used to neutralize the acids by using the standardized sodium hydroxide solution. It reacts with bases which is sodium hydroxide‚ NaOH to form salt and water. The equivalence point of this neutralization reaction can be determined using a chemical indicator to signal the endpoint. The graph should be plotting to take reading of the equivalence point. Once the equivalence point of the titration is known‚ the concentration of the sodium hydroxide can be determined. The sodium hydroxide is then use to
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Reacting Acids and Bases Lab Report Introduction Every liquid‚ except for distilled water‚ has either acidic or basic traits. An acid is sour tasting‚ and gives a sharp stinging pain in a cut or wound‚ and bases taste bitter‚ and feel slippery. A pH scale is used to determine what traits a liquid has; acidic or basic. The scale focuses on OH- (hydroxide ions) and H+ (hydrogen ions). The scale goes from 0 to 14. 7 is distilled water‚ as it is directly in the middle; neither acidic or basic. Acids
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of the chemical composition of cells is the pH of their environment. Most cells operate in a narrow pH range. That is‚ pH values above or below a certain value may cause a cell distress or may even be fatal. To help maintain relatively constant pH levels‚ living systems use buffers. A buffer is a combination of a weak acid and a weak base that function together to minimize changes in the pH of a solution. In today’s lab‚ we will learn how to measure pH and demonstrate how buffers work. II) Procedure
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crushed and weighed to the nearest 0.01 g which was 0.5003 g and 0.5014g. Then‚ transferred into a 250 mL flask and added 50.0 ml 0.1M HCl using an acid burette. Then‚ the antacid was dissolved in the acid. After that‚ the two drops of phenolphthalein indicator were added and was mixed thoroughly. Lastly‚ the antacid mixture was titrated with 0.1 M NaOH the solution turned to a faint pink color. Recorded the final volume of NaOH used. Here‚ two trials were done. After the procedures‚ the weight of HCl that
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Murphy Nmezi August 9‚ 2011 Predictions 1. Sucrase will have the greatest activity at pH 6 2. Sucrase will have the greatest activity at 40 °C (104 °F) 3. Sucrase activity increases with increasing sucrose concentration until a plateau is reached. Materials and Methods Effect of pH on Enzyme Activity. 1. Dependent Variable. amount of product (glucose and fructose) produced 2. Independent Variable. pH 3. Controlled Variables. temperature; amount of substrate (sucrose) present; sucrase + sucrose
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hydroxide (NaOH). In order to do so‚ we prepared NaOH solution‚ prepared a buret‚ and standardized this solution by performing a colorimetric titration of the KHP with the solution until a color change was present. The color change was introduced by an indicator known as phenolphthalein‚ which caused the solution to go from colorless to pink‚ which marked the endpoint of this titration. As a result‚ the concentration of the NaOH solution was found to be 0.124 M with a standard deviation of 0.004 M. In the
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