Al2Se3 (s) + H2O (sub>(l) ==> Al(OH)3 (s) + H2Se(g)
You can see that this reaction produces hydrogen selenide gas. But it will be wet because of the water. I can't draw diagrams on the computer so you will need to research your text and notes to see how to set up the apparatus. Please note that you must use a drying agent to remove the water from the gas AND the drying agent must not absorb the hydrogen selenide gas.
On another matter, the other question to which you refer probably are the Uuh, element #116, fluoride. Here is a web site that shows the periodic table in all its glory. Look for element #116. It will have chemical properties similar to others in that group. S, for example, forms SF6
I didn't get all of the equation correct. The water should be
H2O(l).
And the periodic table site is
http://www.webelements.com/
I have a selection of equipment:
additional funnel, wash bottle, funnel, porcelain boat, side arm connector, bent glass tube, gas jar, U-tube, straight glass tube and polythene connectors(unlimited)
Which of them should i use and how to connect them to make an apparatus to prepare a gas jar of dry hydrogen selenide.
Hydrogen selenide can be prepared by reacting aluminium selenide with water, the other product being solid aluminium hydroxide.
Please help.
Im looking for the answer for this one 2! just cant believe how many people are on here doing S103!
Good luck!!
And good luck to you.
Can you help with Question 3 c
(highest fluoride and highest hydride) ?
afraid not!! soz!
only on q 1 still!!
Do u kno Q1 F ii?
This defo aint my subject!!
and I thot the last TMA was hard
To set up the apparatus to prepare a gas jar of dry hydrogen selenide, you will need the following equipment:
1. Porcelain boat: This is used to hold the reactant, aluminum selenide (Al2Se3).
2. Side arm connector and bent glass tube: These are used to connect the porcelain boat to the rest of the apparatus.
3. U-tube: This is used as a drying agent to remove the water from the gas. It should be filled with a suitable drying agent that does not absorb hydrogen selenide gas. Common choices include calcium chloride (CaCl2) or anhydrous sodium sulfate (Na2SO4).
4. Straight glass tube: This is used to collect the dry hydrogen selenide gas in a gas jar. It should be connected to the U-tube.
Here's how you can set up the apparatus:
1. Place the porcelain boat in a suitable location, such as a laboratory stand or clamp.
2. Connect the side arm connector to the porcelain boat. Insert one end of the bent glass tube into the side arm connector.
3. Connect the other end of the bent glass tube to the U-tube. Ensure that the U-tube is oriented vertically.
4. Connect the straight glass tube to the U-tube and position the open end inside the gas jar.
5. Fill the U-tube with the drying agent (e.g., calcium chloride or anhydrous sodium sulfate). The U-tube should be at a downward angle to prevent any moisture from entering the gas jar.
6. Start the reaction by adding water (H2O) to the porcelain boat containing aluminum selenide (Al2Se3). This will release hydrogen selenide gas (H2Se).
7. As the gas is produced, it will pass through the bent glass tube, into the U-tube, and then into the gas jar. The drying agent in the U-tube will remove any water from the gas, ensuring that the collected gas in the gas jar is dry.
Remember to handle all chemicals and glassware with care, use appropriate safety precautions, and consult your laboratory manual or instructor for specific guidelines and procedures.
Regarding Question 3c (highest fluoride and highest hydride), since you mentioned that you are still on Question 1 and this is not your subject, it might be best to focus on one question at a time and seek assistance from someone who is more knowledgeable in the subject matter.