Topic : Determination of the amount of dissolved oxygen in a water sample by iodometry-the winkler’s method. Objective: To determine the amount of dissolved oxygen in a water sample by iodometry- the winkler’s method. Apparatus: volumetric pipette‚ 3 conical flask‚ burette‚ burette clamp‚ Pasteur pipette‚ reagent bottle‚ conical flask stopper‚ retord stand‚ white tile Materials: 2 ml manganese sulphate solution‚ 2 ml alkaline-iodine solution‚ 0.025M sodium thiosulphate solution‚ 2ml concentration
Free Iodine Sulfuric acid Titration
THE IRISH POTATO FAMINE Pre-Famine History The potato was introduced to Europe sometime in the 16th century. There are many theories on how it arrived‚ but the one with the most credibility is from a case study done by Theresa Purcell. She explains how the white potato‚ also known as the Irish potato‚ originated in the Andean Mountains and was brought to Europe by the Spaniards. The potato was originally classified in the same family as the poisonous nightshade so people refrained from eating
Premium Ireland Great Famine Phytophthora infestans
movement of water in the cell. Independent variable is the factor that affects the value of variables dependent to it. In osmosis lab‚ the independent variables are the potato and onions. The dependent variable is the variable whose value is measured to determine the extent of the effect of another variable to it‚ as in an experiment. In osmosis lab‚ the dependent variable is the length of the potato. The controlled variables are the amount of water‚ amount of salt‚ and the size of the potato. If the
Premium Concentration Osmosis Chemistry
potatoes have faster water movement depending on the concentration of sucrose it was placed in. We had two sized potatoes‚ 6g and 10g‚ and placed each in three different dilutions of sucrose at 0.5M‚ 0.1M‚ and 0.05M. We also placed a 6g and 10g potato piece in water to act as a control. Based on the weight percent change over 60 minutes‚ the 6g potato piece had faster water movement than the 10g. This confirms out hypothesis that smaller potato pieces will have a faster rate of water movement. Introduction
Premium Chemistry Concentration Osmosis
INTRODUCTION: In biology‚ osmosis is defined as the diffusion of solvent molecules (usually water molecules) across a semi-permeable membrane from a region of lower solute concentration to a region of higher solute concentration. Osmosis is of great importance in biological processes where the solvent is water. The transport of water and other molecules across biological membranes is essential to many processes in living organisms. The pressure exerted
Premium Potato Osmosis Cell wall
be discussing a potato chip company that has changed its market structure and what affects this change has made on the company‚ businesses that work with the company‚ and consumers. Prior to Wonks potato chips being in existence it was independent potato chip companies that operated in the Northwest that were ran in a competitive structure and in long-run competitive equilibrium. Once these potato chip companies were all bought up and turned into one company called Wonks potato chips which is now
Premium Economics Monopoly
Right to self-determination All of us have the right to self-determination. In a far view‚ right of self-determination simply means that all people have the right to freely determine their political status and pursue their economic‚ social and cultural development. This merely involves the freedom to acquire and dispose of property and wealth generally as the person choses. Right to self-determination is an unalienable right; the government can’t take the right away. The specific right applies
Premium Human rights Autonomy
Determination of pKa James McDuffie ABSTRACT: In this lab‚ the pKa of unknown solution #4 was measured Introduction: This lab focused on the equilibrium constant‚ Ka. Ka is associated with chemical properties of acids. The equivalence point will be reached once the moles of OH- equal the moles of HA and once this point is reached‚ the PH changes very quickly. With the results‚ a titration curve should be produced. Experimental Section Materials and Methods: A buret with NaOH solution
Premium Titration Acid dissociation constant PH
The Importance of Determination Everyday people face challenges‚ but it is important that one does not give up‚ and to keep trying until they successfully overcome the obstacles that stand in their way. “Mother to Son” by Langston Hughes and “Still I Rise” by Maya Angelou are two different works written by two different authors yet they both convey the same message. Together‚ the two authors stress the significance of pushing harder when faced with conflicts rather than simply giving up. Using
Premium Maya Angelou Metaphor Poetry
significant bonuses is a way to keep your best people from looking elsewhere for a job. 3. Bonuses are usually determined as a percentage of annual salary‚ though giving all employees the same monetary bonus is also an option Eligibility and determination of bonus Every employee shall be entitled to be paid by his employer in an accounting year‚ bonus‚ in accordance with the provisions of this Act‚ provided he has worked in the establishment for not less than thirty working days in that year.
Premium Employment Summation Addition