Concentration Essay Examples

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Chemistry: Displacement Reactions

Objectives: 1. Learn how to determinate the percent composition 2. Learn how to get the percent using oxidation reduction and double reactions 3. To become more familiar with the use titration techniques 4. To learn how to get the salt out of an quimical Background: To develop and utilize procedures to determine the percent composition,…

Cell Transport Mechanisms and Permeability

Purpose The purpose of this lab is to teach me simulating dialysis, simulating facilitated diffusion, simulating osmotic pressure, simulating filtration, and simulating active transport. Hypothesis If I increase the concentration of sodium chloride from 9mM to 18mM in the left beaker, then the rate of diffusion will increase, because concentration is a variable that affects…

Cell Transport Mechanisms and Permeability

Cell Transport Mechanisms and Permeability Purpose The purpose of this lab is to teach me simulating dialysis, simulating facilitated diffusion, simulating osmotic pressure, simulating filtration, and simulating active transport. Hypothesis If I increase the concentration of sodium chloride from 9mM to 18mM in the left beaker, then the rate of diffusion will increase, because concentration…

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Determination of Asa Content of Aspirin

Aim: To determine the Molar Concentration of NaOH and HCl acid used in their Standardization processes and to determine the acetylsalicylic acid (ASA) content in Aspirin. Materials/Apparatus: materials used are the same as that outlined in the laboratory procedure prepared by the laboratory instructor. Procedure: The procedure used is the same as that outlined in…

Cell Transport Mechanisms and Permeability

Exercise1 Cell Transport Mechanisms and Permeability Name ____________________________________________________________ Lab Time/Date ______________________________ Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. * The size of the pores of the membrane * The size of the molecule diffusing through the membrane 2. Why do you think the urea was not…

Geographies of Social Difference

Map 1: [Figure 2, People not fluent in English as a percentage of the total population aged 5 years and over, Sydney, 2006] (a) Compare the spatial pattern of the map to the map of unemployment. Does the map share the same spatial pattern as unemployment (i.e. do the areas of high and low concentration…

Determining the Osmolarity of a Potato

Abstract Students in Biology find it difficult to understand the concept of tonicity and osmolarity in a real time situation. In this investigation, several concentrations of sucrose were used to determine the osmolarity of a potato. It was found that the concentration of sucrose was close to 3.6 in the potato used showing that it…

To investigate the effect to the potato cells in the different solute concentration water

Water can move through the different cells due to the difference of water potentials in the cells. If there is a higher solute concentration in the cell than outside the cell, the water will move into the cell. However, if the concentration of inside the cell is lower than the outside, water will not move…

Recrystallization Lab

Recrystallization is a method used for purifying solid organic compounds. It is the most efficient method to purify and remove impurities from a solid to allow a crystal to grow. The method is when the solute in a hot solvent yields to a solution. Once the solvent cools, the solution is saturated with respect to…

The effects of osmosis

Introduction: Osmosis is a movement of water across a semi-permeable membrane. This may only happen when there is a difference in concentration between the two sides of the membrane. The water moves from low concentrations to high concentrations. That is because the low concentrated area tries to dilute the opposite via osmosis. The effects osmosis…

Experiment to Investigate Osmosis in Potatoes

The aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain what osmosis is. Osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to…

Practical assesment about biology

Osmosis is defined as the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane. Osmosis is considered in terms of water potential and solute potential. Water potential is a measure of the kinetic energy of water molecules. Here, water molecules are…

Marble Chip Investigation

Fair Test To make it a fair test and make my results more accurate I will try and keep all variables constant except the concentration of the acid. This will include weighing the marble chips every time and trying to use lumps of roughly the same size to keep the surface area fairly constant as…

Why doesn’t jelly set when fresh pineapple is used?

Basic Problem: Jelly is made from protein, gelatin, this is dissolved in hot water and as it cools, it sets. For a childrens party it was decided to make some fruit jellies, these were made by putting sliced pineapple into the jelly before it set, the following observations were made: oThe jelly set normally when…

Separating the Components of “Panacetin”

Panacetin purportedly includes sucrose, aspirin, and acetaminophen. However, the accuracy of Panacetin’s contents has been called into question by the Association for Safe Pharmaceuticals. Therefore, the lab must discover the accuracy of the ingredients listed on Panacetin’s label. The unknown in this experiment is presumed to be something similar to acetaminophen, such as acetanilide or…

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