PH

Materials & Method The present study was a clinical study carried out to evaluate the changes in salivary ph, after consumption of different snacks and beverages and to estimate their oral clearance time. SAMPLING: 60 randomly selected undergraduate students from hostel inmates of K.D. Dental College and Hospital, Mathura were examined. Out of these, 5 subjects were selected on the basis of following inclusion and exclusion criterion: Inclusion Criterion: • Subjects who were caries free i.e. DMFT

the relationship between enzymatic reaction affected by temperature and pH. Through the testing the enzyme at different temperatures, and different pH levels; it would determine at which temperature and pH level the enzyme worked the most efficiently. Analyzing absorbance of the solutions with spectrophotometery will determine the reaction rate. To test the optimal pH, the starch and a buffer were combined at a specific pH level and tested the absorbance of a solution at various times. To resolve

Question: The equivalence points of the two titration curves were not in the same pH range. Explain. (Why was the pH at the equivalence point different for the two different acids?) • HCl + NaOH → NaCl + H2O While both NaCl and H2O are neutral, then pH = 7 • HC2H3O2 + NaOH → NaC2H3O2 + H2O While H2O is neutral but NaC2H3O2 is basic, then pH > 7 Problem & error: Write a paragraph about the issues you had in performing this lab. What went well, what did not go so well? What could you have done

Determining pH Introduction: In this Lab report we will be using Red Cabbage extract as an indicator to determine the pH of substances. The purpose of this experiment is to see if and how base and acids react. Indicators are chemicals that change color depending on the pH solution that they are dissolved in. This experiment will determine which items we use to determine ph. The pH of a solution indicates its acidity or alkalinity. There is a ph. scale that determines if the items

The Effect of pH on the Rate of Osmosis Using a Glucose Solution Melissa Werderitch Biology 157 11/6/06 Introduction In a journal article written by Florian Lang, osmosis is essentially explained as the flow of water from one area to another that are separated by a selectively permeable membrane to equalize concentrations of particles in the two locations (Lang, 1997). Osmosis is able to maintain osmotic pressure and regulate a cell's volume. In a hypotonic () or hypertonic () environment

Introduction: A buffer solution is which resists large changes in pH when the small amounts of an acid or a base are added to it. The buffer can be calculated based on the equation of ionization pair of acid and conjugate base. Any weak acid can be represented as “HA” and "A-" as the conjugate base. This equation is based known as Henderson-Hasselbalch equation which is used to calculate pH of a solution. Figure 1: Henderson-Hasselbalch equation Buffer solution can be divided

The procedure of this lab is to determine if liver and potato cells contain natural buffers that resist large change in pH as 1. NaCl or 1. NaOH are added to the solution. Hypothesis: If adding an acid or a base to liver and Potato cells then the solutions will become buffers. Materials: pH paper- cut into chunks 0.1 Molar NaCl 0.1 Molar NaOH Commercial Buffer Solution- pH 7 Liver homogenate- 10g per 100mL of water Potato homogenate-10g per 100mL of water 25 mL graduated cylinder 50mL beaker

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

Projected changes of pH over the next 100 years due to Ocean acidification effects phytoplankton-doubling time. Projected pH effects phytoplankton productivity. Nicole M. Messere Messere.n@husky.neu.edu Northeastern University 360 Huntington Avenue, Boston, Massachusetts 02115. Keywords: Ocean acidification, pH, Haptophyta, Myzozoa, bacillariophyta, cyanobacteria Abstract The purpose of this study was to understand and based on results to support the predictable negative effects of ocean

Respiratory Acidosis and Alkalosis Activity 1: Normal Breathing 1. At 20 seconds, pH = 7.4 2. At 40 seconds, pH = 7.4 3. At 60 seconds, pH = 7.4 4. Did the pH level of the blood change at all during normal breathing? If so, how? No, the pH level of the blood did not change during normal breathing. 5. Was the pH level always within the “normal” range for the human body? Yes, the pH level was always within the normal range for human body. 6. Did the PCO2 level change during the course of normal