during the course of experiemnt which of the floowing happens to the no3-

What happens to the NO3-ions during the course of the experiment?

During the course of the experiment, which of the following happens to the NO3- ions? They remain dissolved in the filtrate solution. M+ is an unknown metal cation with a 1+ charge. A student dissolves the chloride of the unknown metal, MCl, in water to make it 100.0 mL of solution.

What happens when H2O2 reacts with MnO4?

In a titration experiment, H2O2(aq) reacts with aqueous MnO4-(aq) as represented by the equation above. The dark purple KMnO4 solution is added from a buret to a colorless, acidified solution of H2O2(aq) in an Erlenmeyer flask.

What is the initial pressure of N2 (G) in each vessel?

The volume taken up by the solids is negligible, and the initial pressure of N2(g) in each vessel is 720 mm Hg. All four vessels are heated to 127°C and allowed to reach a constant pressure. At 127°C, the pressure in vessel 1 is found to be higher than that in vessel 2.

Which mass was lost during the third heating of the sample?

No additional mass was lost during the third heating, indicating that all the water of hydration had been driven off. One point is earned for the correct explanation. (b) Use the data above to (i) calculate the total number of moles of water lost when the sample was heated, and mass of H 2 O lost = 25.825 − 23.977 = 1.848 g OR

Why is the temperature of water lower?

OR Incomplete combustion of the lauric acid. The temperature of the water is lower because less heat was released from the combustion reaction.

Is sucrose more soluble than lauric acid?

Justify your answer in terms of the intermolecular forces present between water and each of the compounds. Sucrose is more soluble than lauric acid. Stronger interactions occur between sucrose and water molecules due to a greater capacity for hydrogen bonding as a result of a larger number of -OH groups in sucrose.

What was the first metal to be isolated?

Copper was one of the first metals to be isolated, due to the ease of separating it from itsores. It is believed that the process was known (metallurgy) as early as 4500 BC. It is a ductile,malleable metal and is easily pounded and/or drawn into various shapes for use as wire,ornaments and implements of various types. Alloys of copper (bronze, brass) were discoveredquite early in history and were among the first impetuses for international trade. Pure copper isthe best electrical conductor of the more abundant metals. It has a good thermal conductivityand is corrosion resistant. Copper as a metal is second in commercial importance only to iron.In this experiment, a weighed amount of copper metal is transformed, through a series ofreactions, into other co pper-containing compounds, and is eventually returned to the metal state.The series involves the use of reactions classified as metathesis, decomposition, displacementand oxidation-reduction reactions. The following equations (unbalanced) outline the series oftransformations to be performed:

How to make CuO?

Place 6 mL of 3M sulfuric acid in a 50 mL beaker. Using a spatula, transfer the blackcopper oxide and filter paper to the acid solution. Stir the mixture with a glass stirring rod untilthe black solid has completely dissolved. Remove the filter paper from the solution, as soon asit is clean, using forceps. Gently rinse the filter paper with 1 - 2 mL of water. Add the rinse tothe blue copper(II) sulfate solution. If residual traces of the CuO remain on the Hirsch funnel,rinse or dissolve this material (holding the funnel over the beaker), using the solution in thebeaker. Once the transfer is complete, rinse the funnel with 1 - 2 mL of water. This rinse is alsoadded to the beaker.