Water Lab Report

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

The materials used in this lab were: beakers, distilled water, iodine, starch and glucose solutions, sucrose solutions at different molarities, dialysis tubing, potato, string, funnel, and scissors.

1. Describe what the results were. According to the results, the higher the concentration of sodium thiosulphate the higher the reaction rate. The graph above shows the reaction rate compared to the sodium thiosulphate solution is almost a straight line showing the relationship of the sodium thiosulphate and the rate of reaction.

This report presents the behavior of water molecules across a membrane and the membranes when they are put into different solutions of different concentrations. The plamolysis of onion skin was tested under water, 0.3M sucrose, and 2.0M sucrose. The water was hypotonic to the onion cells causing the cells to become larger and less pigmented. The sucrose was hypertonic to the cells leading to osmosis and the cells to become shriveled and more pigmented as the color was left in the cells. Observed from the experiment, the higher the concentration of the sucrose the smaller the cells became.

Purpose: is to determine the unknown bacteria with a variety of biochemical tests. There are many reasons that contribute to why it is so important to test patients for both high and low risks diseases. The most important reason would be to know the identity of microorganism and how it can be treated .This study was performed in microbiology laboratory class by applying the microorganism to the tests that have been performed in the class prior to the identification of the unknown. First, the lab professor handed out a bacteria that was on the unknown streak plate labeled B5 that consisted of an unknown gram positive or gram negative bacteria.

Osmosis is the movement of water molecules from an area of high water concentration to an area of low water concentration through a partially permeable membrane. Cell membranes are selectively permeable which means that some solutes cross the membrane with no resistance, some cross with assistance, and others do not cross at all. In this lab we tested osmosis, movement of water across a permeable membrane. To test this we filled and weighed four different dialysis bags; two filled with RO water, one with 15% sucrose solution, and the last with a 30% sucrose solution.

The approximate NaCl concentration that is isotonic with erythrocyte contents is 0.12M. Osmosis is a type of passive diffusion which involves the net movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration. Water travels across the membrane via two methods. The first method is through the phospholipid bilayer by diffusion and the second through aquaporins, proteins on the membrane which contain a hydrophilic core which enables them to function as water channels. When osmotic pressure on the both sides of the plasma membrane is the same, cell volume stays constant.

AIM The aim of the experiment was to observe the effects the concentration as on the rate of osmosis. HYPOTHESIS The smaller the amount of concentration the quicker osmosis will occur.

Have you ever thought about what you would drink if you ever got stranded in the wilderness without clean water? Well Mr. Troen has, and he decided to test our class’s wisdom on the subject. In this lab we received slough water and were told to make it so we would drink it. In my group we decided to try a number of different things to make it drinkable.

Measuring Osmosis: Potato Cores Introduction: The purpose of this experiment was to understand what osmosis is and to be able to measure it. Osmosis is the movement of water and the water moves from area with high concentration to an area with low concentration. During that lab potatoes were cut up to a of total of four pieces of potato per cup, with a total of six cups and twenty-four pieces of potato.

How could I turn my somewhat “dirty” reservoir water into clearer drinkable water? In other words does hand filtering this water create a cleaner result? Hypothesis 1: If I were to collect water samples from my reservoir and place it through two different filtering techniques (boiling/using a filter sheet and one just using a filter sheet), then the water will become clearer using the boiling technique because it’s going through a filter sheet then its bacteria is being boiled away. Does placing birdhouses and bird seeds/water in my trees increase the number of birds I see around my house?

The hypothesis stated that if the temperature is changed, then the water’s state of matter will change because an increase of temperature will form a gas and a decrease of temperature will from a solid. The hypothesis was correct. The ice started to melt due to the room temperature being hotter than the ice, so it formed a liquid. When the beaker was placed on the hot plate when it was turned on, it made a big temperature change. Due to that temperature change, a gas was formed from a liquid and that liquid use to be a solid. Therefore, temperature changes water’s state of

Introduction In order to function, all cells must be able to allow certain solutes into and out of the cell through its plasma membrane. These membranes are selectively permeable, meaning some solutes are able to pass through the membrane unaided and while other solutes require other means of transport, such as diffusion or osmosis. Osmosis is the movement of water from an area of high concentration to an area of low concentration across a selectively permeable membrane. Because cells are completely permeable to water, the movement of water into and out of the cell can have major effects on its tonicity – or osmotic pressure gradient on the membrane.

This was a wonderful experiment that had to deal with the fundamentals of Tonicity. First off, what is Tonicity? Tonicity is a measure of the effective osmotic pressure gradient of two solutions separated by a semipermeable membrane. In other words, tonicity is the relative concentration of solutions that determine the direction and extent of diffusion. There are three different types of tonicity, namely Hypertonic, Isotonic, and Hypotonic.

Table 2: Consists of color extract taken from a red cabbage for a natural indicator. The pH reading that was measured by using the pH meter and the result of the pH reading to determine whether the solution was acidic or basic.