The iron salts that are soluble pass through filters and a stay in the tap water until they come in contact with the air.
Chemical Formulas and Names of Ionic Compounds Ionic compounds are formed when positive cations and negative anions are attracted to each other via strong electrostatic forces.
Transfer just a small amount of the iron II sulfate powder to an empty test tube. Be sure to include the physical states of all reactants and products in your final equation. See image for approximate amount. See image for amount to use. Four questions - 5 points each Total - 50 points Formative Assessment The teacher will circulate the room and ask students questions about their chemical reactions.
Certain salts of iron are soluble and some are not. So iron III sulfate would also be called ferric sulfate.
Fill the test tubes to about half full or to the height of the white plastic posts. Removal of copper ions Earlier you should have dissolved a crystal or two of copper II sulfate into a test tube.
The caps don't have to be these colored ones, but the clear plastic caps are fine. In a few minutes, the light green color of the weak solution has turned into dark green particles that are starting to settle out.
Look for any precipitation. Add a little purified water will help hold the filter paper in place. Then they form the reddish-brown iron stains. Fill the test tube to about half full with purified water. There is a bit of a color difference between these silver halides.
The teacher can use this data table to discuss observations data and formulas as a class. When a double replacement reaction occurs, the cations and anions switch partners, resulting in the formation of two new ionic compounds AD and CB, one of which is in the solid state.
The bottom equation shows that the ions of barium, chlorine, magnesium, and sulfate are all in water indicated with the aq subscript. In addition, all acids are soluble.
The three most common unstable compounds which give gases are: Purpose The purpose of this lab was to observe the results of many double replacement reactions, as well as to practice writing non-ionic, complete ionic, and net ionic equations for precipitation reactions.
However, it still is a double-replacement reaction. First write the unbalanced equation: Silver and Bromide Ions combined together have a low solubility which allows for it to be a precipitate. The photo was that of the photographer, Robert Cornelius.
For example, the third reaction on the data table is the reaction between sodium chloride and lead nitrate. Algae are very hardy plants that are difficult to kill, but copper ions are commonly used to kill algae in pools and ponds.
Iron levels won't be that high in tap water. Copper and sodium swap places. Since one of the predicted products is insoluble, a precipitation reaction is will occur. The attached teacher lab answer key lists the materials and preparations needed.
Get the plastic funnel from the kit and set it in an empty test tube.
All compounds of NO3- are soluble. For this experiment, we will use silver nitrate to produce double-replacement reactions with three different halides chloride, bromide, and iodide.
Most phosphates, carbonates, chromates and sulfides are insoluble except those of the alkali metals and ammonium. Notice the acidic hydrogen on acetic acid is shown in red. Add a little purified water will help hold the filter paper in place.
All others are insoluble. Here we have both precipitates from the strong and weak solutions of iron II sulfate. For additional practice, students can take a chemical reactions classification quiz online at the following website: The CO2 will have escaped.
Lye sodium hydroxide is used to make biodiesel and for unclogging a drain.
GCC CHM LL: Double Replacement Reactions Fall page 4 of 9 Note that the physical state aqueous, (aq), must be included to distinguish the acid from other forms of a substance. Double replacement reactions typically form a product that is either molecular or ionic.
gas, or aqueous solution (dissolved). In this lab, each reactant substance is already in aqueous solution, so you can automatically indicate this using the “(aq)” label. One of the factors driving a double replacement reaction is the formation. When a double replacement reaction occurs, the cations and anions switch partners, resulting in the formation of two new ionic compounds AD and CB, one of which is in the solid state.
This solid product is an insoluble ionic compound called a precipitate. Describe how to predict a double-replacement reaction. Describe the properties of the ionic compounds made in this lab. Describe what double-replacement reactions are used for. Double Displacement Reactions: Forming Precipitate Introduction In this lab, double replacement reactions between compounds were done in order to determine the equation and description of a new substance.
May 07, · We'll learn about the five major types of chemical reactions: synthesis, decomposition, synthesis, single replacement (also called single displacement) and double replacement (also called double.Double replacement reaction lab