and fragility of erythrocytes.With the exception of the method for determining erythrocyte fragility‚ conventional hematological laboratory procedures were used. The fragility technique consisted of introducing 0.4 cc. oxalated blood into a colorimeter tube containing 8 cc. of sodium chloride solution. The saline solution and blood were
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of the experiment is to find out the effect of salt concentration in a beetroot at a different temperature. The experiment will help to identify the effect of salt concentration in beetroot at different temperatures. After this‚ equipment called colorimeter will be used to take a reading for absorbency. The readings for the absorbency will be repeated three times in order to find the mean of each sample and to also find out the standard deviation of each set of data which will be recorded in a table
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Trail 5: k=33.787 Average Rate Constant: Trial1+2+3+4+5=145.774/5=29.1548 Procedure Obtain and wear goggles. Connect a Colorimeter to Channel 1 of the Vernier computer interface. Connect the interface to the computer with the proper cable. Start the Logger Pro program
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SPECTROPHOTOMETRY Spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength It involves with the use of a spectrophotometer. A spectrophotometer is a photometer that can measure intensity as a function of the light source wavelength. A spectrophotometer is commonly used for the measurement of transmittance or reflectance of solutions‚ transparent or opaque solids‚ such as polished glass‚ or gases. Principles
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pieces of beta vulgaris used be of the same length and diameter. Light intensity. It is important that the investigation is carried out in the same light intensity because the absorption will be different for different intensities. Colorimeter. The same colorimeter should be used throughout the experiment to make sure that the accurarcy to which the
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called molar absorbency‚ l is the length in cm‚ and c is the concentration). Using Beer’s Law in this lab a colorimeter is used to find the absorbance and from this the concentration of dissolved Cu2+ ions can be found and percent mass calculated. The techniques used in this lab are useful in that they provide little human error for various parts of the lab by taking the measurements by a colorimeter human error is reduced. Experimental Procedure Equations Used M1V1=M2V2‚ Beers Law: A=elc+b‚ Morality=
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of a reaction introduction Coloured solutions absorb some of the wavelengths in the visible region of the electromagnetic spectrum. A colorimeter can be used to measure the amount of light absorbed by a solution (the absorbance) and this is proportional to the concentration of the coloured species present. In this experiment you will use a colorimeter to investigate the reaction between bromine and methanoic acid:- Br2 (aq) + HCOOH (aq) ↓ 2Br- (aq) + 2H+ (aq) + CO2 (g)
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WHY DOES THE COLOUR LEAK OUT OF COOKED BEETROOT? PLAN Hypothesis Temperature has an effect on the leaking of the colour from beetroot. This means that as the temperature is altered there will be a change in the rate of colour leakage. Scientific Background Beetroot is a very familiar vegetable and is commonly known as beet. It is famous in most recipe books that advice that its outer skin is not to be removed to avoid getting red dye in the cooking water. If we look at the internal structure
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PLANNING COURSEWORK- STARCH AND AMYLASE AIM The aim of this coursework is to investigate the effect of temperature change‚ on the rate of hydrolysis of starch catalysed by amylase. PREDICTION I think that as the temperature increases‚ the rate of reaction also increases‚ to a point when it dramatically decreases. On graph 1‚ you will see a sketch of the graph which I expect to be the result of the experiment. SCIENCE REASONING I think my prediction is correct because the rate of
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concentration are directly are proportional. A Beer’s law plot is a graph showing the linear relationship between absorbance and concentration that can be fit to a straight line from which the concentration of an unknown sample can be calculated. A colorimeter is a type of
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