Red Cabbage Indicator Aim – To create a pH indicator out of a red cabbage solution and to construct a basic pH scale to determine the pH of unknown solutions. Materials - • red cabbage leaves • 250 mL beaker • hotplate or Bunsen burner‚ tripod‚ gauze mat and bench mat • 10 test-tubes – equal size • test-tube rack Methods - Part A: Making the indicator 1. Tear up one or two red cabbage leaves‚ and place them in the beaker with enough water so that the cabbage is just covered. 2. Heat the beaker
Premium Water Acid Base
Factors Influencing Rate of Reaction Aim To investigate several effects believed to influence rate of reaction‚ concentration of a substance and temperature‚ and observe the effects. Hypothesis Concentration and temperature will both increase the rate of reaction in accordance with collision theory. Introduction The reaction rate or rate of reaction for a reactant or product in any given reaction can be defined as the speed with which a reaction occurs. For example‚ the oxidation of iron
Premium Chemical reaction Reaction rate Chemistry
------------------------------------------------- COLORIMETRIC DETERMINATION OF pH ------------------------------------------------- Abstract This experiment examined the result of the various color indicators combined with different buffer solution‚ thereby testing the precision and accuracy of determining the pH value colorimetrically. Colorimetric method is a simple and practical procedure with an important advantage: they do not get out of order as from time to time do the pH-meters. Four buffers (Acetate buffer‚ phosphate
Premium PH indicator PH
Chemical Reactions The idea of chemical reactions was investigated about two hundred and fifty years ago‚ when a man named Antoine Laurent Lavoisier wanted to know about the importance of chemical changes. Also‚ in the 19th century‚ John Dalton made the atomic theory. Dalton said that bonding atoms together makes new substances‚ which is a chemical reaction (History of chemical reactions). The definition of chemical reaction is‚ “the processes in which substances undergo chemical changes‚ which
Premium Chemistry Chemical reaction Chemical substance
Photocatalytic degradation of methylene blue using TiO2 nanoparticles Nupur Mittal Chemical Engineering‚ IIT (BHU) Varanasi. Abstract: The aim of this research is to reduce the pollution caused by methylene blue dye in waste water coming from textile industries. For this purpose‚ TiO2 nanoparticles are made as they show good photocatalytic activity in degradation of dyes into harmless products. Synthesis is done using titanium butoxide and 2-propanol. The particles formed were a little larger
Premium Chemistry Ultraviolet Chemical reaction
Economy of scale refers to the benefits of producing on a large scale. When firms and industries increase the scale of their operation there can be advantages which reduce the average (unit) cost of their output. Internal economy of scale is the benefit‚ in the form of lower average costs‚ which a firm can gain from increasing its size. Internal economies of scale arise from the growth of the firm itself. One internal economy of scale can be marketing economies. For food retail industry‚ large
Premium Economics Retailing Firm
ECONOMIES OF SCALE Economies of scale are an important aspect of efficiency in production .Economies of can henceforth be define as ‘the reduction in average costs of production‚ that occur as a firm increases in size’. As businesses grow and their outputs increases‚they commonly benefit from a reduction in average costs of production.Total costs will increase with the increase in output‚but the cost of producing each unit falls as output increases .The reduction
Premium Economics Firm Leasing
Attitude Measurement: Likert Scale The Dogmatism Scale Please do not skip any of the statements‚ and answer each statement to the best of your ability. Strongly Agree‚ Agree‚ Sometimes‚ Disagree‚ Strongly Disagree 1.) Once an idea is in my head‚ I stick with it. 2.) My own personal beliefs seem to be more right than others. 3.) I am open to hear others opinions and let them at least try to change my mind. 4.) I would rather agree with someone‚ even though I know they are wrong‚ just because we
Premium Belief Opinion Psychometrics
This experiment shows the effects of changing the pH level has on Catalase. As predicted‚ the farther away the pH levels got from the optimum pH (7.2)‚ the lower the reaction rate. At a pH of 7.2‚ the foam of the reaction measures 6cm. At a ph of 3 it measures 2.5 cm‚ at a pH of 5 it measures 2.75 cm‚ at ph 9 it measures 2.3 and at 11cm it measures 2cm. pH measures the hydrogen ion concentration of a substrate. By changing the pH of the catalase‚ the enzyme was denatured. Denaturing is the result
Premium Enzyme Chemical reaction Catalysis
[ print page ] 04.05 Chemical Reactions: Combustion: Lab Worksheet and Rubric Before You Begin: You may either copy and paste this document into a word processing program of your choice or print this page. Procedure: 1. Iron (IIII) and copper (II) sulfate solution Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction. 2. Lead (II) nitrate and potassium iodide solutions Pour about 2.0 mL of lead (II) nitrate into
Free Hydrogen Oxygen Chemical reaction