Question

A chemistry student carried out an experiment with a conducting apparatus similar to the one below. The following data was taken.



Solution Reading
0.1 M H2SO4 150 ma.
0.1 M Ba(OH)2 150 ma.
To 30 mL of the Ba(OH)2 solution, 10 mL portions of H2SO4 were added until a total of 50 mL of H2SO4 were used. The following results were recorded.

DATA TABLE

Total H2SO4 Added Meter Reading Observations
0 mL 150 ma. Ba(OH)2 and H2SO4 clear, colorless
10 mL 65 ma. milky white precipitate forms
20 mL 31 ma. more precipitate forms
30 mL 0 ma. precipitate heavy and settles
40 mL 29 ma. no

Answer 1

questions...Explain the data.

Is any evidence shown that a reaction has occurred?


2.does the conductivity increase or decrease?
3.Does the number of ions in solution increase, decrease, or remain constant?
4.How can you tell?
5.How does this evidence indicate that the reaction has occurred between ions?

Answer 2

PLEASE HELP:(

Answer 3

@sasogeek could you help me with this?

Answer 4

i cannot understand how to do this and the questions..

Answer 5

I'm sorry but I can't, I'm not very good at this... you should probably post it in the chemistry group... :)

Answer 6

okay:)

Answer 7

You need first to write down the general reaction. Here is the link http://goo.gl/NhIHQ Then you need to find the limiting reagent so you can determine if the number of ions in the solution increases, decreases, or remains constant. To answer your questions:
1. Is any evidence shown that a reaction has occurred? Yes, Barium Sulfate BaSO4 is formed, the evidence is the milky white precipitate.
2.does the conductivity increase or decrease? You need to find the limiting reagent to know this, and also you have the miliamperes (ma) observations.
3.Does the number of ions in solution increase, decrease, or remain constant? Find the limiting reagent.
4.How can you tell?
5.How does this evidence indicate that the reaction has occurred between ions. the current changes as you add up H2SO4, and also the milky white precipitate forms.

I hope this helps you, any question ask me!

Answer 8

thanks!:)

Answer 9

hey @antoniioreyes what is a good hypothesis for this => The Temperature Dependence of Salt Solubility

Answer 10

i have this so far,....If salt depends on temperature, then...

Answer 11

The solubility of a substance in water depends on several factors. One of the most important factors is temperature. Temperature is a direct result of the kinetic movement of the solution molecules/ions. The higher the temperature the greater the kinetic energy of the solution molecules. The higher the kinetic energy of water molecules, the better the chance they have of dislodging solid molecules and thereby getting them into solution. This is so because the water molecules collide with the solid and higher collision energies lead to more effective dislodgment and thus solubility.

Answer 12

but i need a hypothesis

Answer 13

what do you mean by a hypothesis?

Answer 14

an if... then statement... a prediction of whats gonna happen i the experiment

Answer 15

Well, if we are talking about the H2S04 + Ba(OH)2 experiment, the overall solubility of the water soluble salt can be increased if we raise the temperature of the reaction.

Answer 16

oh ok thanks!