manual. A hydrogen phosphate buffer at pH 7 was used. 60.97g of KH2PO4 (acid) and 20.42g of K2HPO4 (base) were weighed out for use. Data 25mL of DIH2O in 100mL beaker had pH = 7.40. After one drop of 0.50M HCl was added to the beaker‚ pH dropped to 3.08‚ and the change in pH was -4.32. After one drop of 0.50M NaOH‚ the pH jumped to 10.3‚ and the change was 2.9. pH of 25mL of created buffer solution = 6.15 Volume of HCl Added to 25mL of Buffer Solution | pH | Concentration of Acid After Addition
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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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Chapter 11 CHEMICAL REACTIONS 153 CHAPTER 11 11. Chemical Reactions All living beings born in this beautiful world have their own life styles. Have you observed and analyzed your daily life from the view point of a chemist? Chemical reactions happen around us all the time and even in our body. Any change can be classified as physical change and chemical change. Physical changes can be easily reversed but‚ it is not easy to reverse a chemical change. What is the reason? In chemical
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Sofia Dominguez 10-O 19/03/14 Effect of pH on germination of seeds: Design Practical Introduction: The term pH stands for Hydrogen Potential it is used to determine the acidity of a substance. The pH scale goes from 0 to 14. The values that are smaller than 7 indicate the range of acidity. Higher pH values are alkaline and a pH of 7 is neutral. Acidity is a function of the concentration of hydrogen ions (H+)‚ or protons. The strength of alkaline solutions is measured by the concentration of hydroxide
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through a solution‚ from pH 2 – pH 9‚ in which jelly cubes were immersed over a 24 hour period Interpretation Written Communication of the Data C1 Pepsin is an enzyme that works in the stomach and has an optimal pH between pH 1 and 4 or in acidic conditions. From our graph it can be seen that that the lowest mean percentage light transmission for pepsin is when the buffer has a pH of 2. Trypsin is an enzyme that works in the small intestine and has an optimum pH between pH 7 and 8 or in neutral conditions
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Will Jeffries 11/12/11 Period Two Organic Chemistry Extraction and Evaporation. Separating the Components of Panacetin. Pre-Lab: Analgesic drugs are known for reducing pain‚ while antiseptic drugs reduce symptoms such as fevers and swelling. However‚ some of these drugs can reduce both illnesses. To obtain a pure compound in these drugs‚ the scientist needs to separate the desired compound by taking advantage of the different physical and chemical properties. Such as; different boiling points
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test the pH level of everyday fruits to see how acidic they actually are. When eaten‚ which fruit will have the lowest pH (be the most acidic)? Hypothesis A sign that a fruit is acidic is a sour taste. Out of all the fruits being tested‚ lemon is the most sour. The common assumption is that the lemon‚ the most sour fruit‚ will be the most acidic and that the banana‚ the least acidic fruit‚ will be the most alkaline. The hypothesis of this experiment fits this assumption. If the pH of different
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html#ixzz25GXbqItt http://chemistry.about.com/od/chemistryglossary/a/aciddefinition.htm http://en.wikipedia.org/wiki/Acid%E2%80%93base_reaction http://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/Calculating_pHandpOH.htm http://idealearthwater.com/faq/what-is-ph-orp Homeostasis - Biology Encyclopedia - cells‚ body‚ examples‚ function‚ human‚ process‚ system‚ organisms‚ blood http://www.biologyreference.com/Ho-La/Homeostasis.html#b#ixzz25GrGwjnr http://www.kentchemistry.com/links/AcidsBases/Electrolytes.htm
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than seven on the pH scale. An example of an acidic substance is lemon juice. A base is a substance that accepts hydrogen ions and ranks higher than seven on the pH scale. An example of a base substance is hand soap. A neutral substance ranks a seven on the pH scale and has equal concentrations of H+ and OH-. An example of this is pure water. Electrolytes are current conducting ions. An example of an electrolyte is Na+. A buffer is a set of chemicals that can keep the pH of a stable by alternately
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us determine our data. The purpose of this experiment is to follow the changes of pH during the titration of an acid and a base in order to determine the of the weak acid‚ . is a constant for a given acid at a given temperature. In this experiment we determined the Ka using two different methods: 1) the measurement of the pH of a solution containing a known concentration of a weak acid‚ and 2) measurement of the pH at the half-neutralization point in the titration of a weak acid and a strong base
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