 classify common substances as acidic, basic or neutral (1 Viewer)

[.ben]

how much do we hav to know about this dtpt thanks.

 classify common substances as acidic, basic or neutral

 

[Dreamerish*~]

Not much.

You should know that common substances such as vinegar, lemon juice, stomach acid, and to a lesser extent milk and saliva are acidic; and that detergents, shampoo, soap, household cleaners, and even blood are basic.

That's it, really.

 

[pLuvia]

I defined the terms of an acid and base, wrote some properties of both of them and just identified some common acids. It should be in your textbook

 

[.ben]

ok cool thanks it's just my class teacher is teaching us a year 11 topic:moles and we're in year 12 now.

 

[.ben]

one more question,

4NH₃(g) + 5O₂ --equilibrium arrow--> 4NO(g) + 6H₂O(g) deltaH=-908

for teh above reaction, rpdecitc how the equilibrium will shift when pressure is increased.

^it kinda sounds wrong because don't they usually give you a specific reactant or product increasing in pressure?

thanks

 

[.ben]

btw how dou you define acid and base because aren't there like 5 different definitions?

 

[Dreamerish*~]

one more question,

4NH₃(g) + 5O₂ --equilibrium arrow--> 4NO(g) + 6H₂O(g) deltaH=-908

for teh above reaction, rpdecitc how the equilibrium will shift when pressure is increased.

^it kinda sounds wrong because don't they usually give you a specific reactant or product increasing in pressure?

thanks

When the total pressure is increased, the equilibrium will shift to the side that has less moles of gas.

If you look at the equation, on the left there are 4 moles of ammonia and 5 moles of oxygen gases, making 9 in total. On the right, there are 4 moles of nitrogen oxide and 6 moles of water vapour, making 10 in total.

Therefore there are less moles of gas on the left, and when the total pressure is increased, the equilibrium will shift to the left, producing more NH₃ and O₂.

btw how dou you define acid and base because aren't there like 5 different definitions?

For the first section of the Acidic Environment, you will learn that an acid is something that ionises to produce H₃O⁺ ions in solution, while a base is a substance that either produces OH^- ions in solution or reacts with an acid to produce salt and water.

However, later in the module you will learn that the most commonly used definition is: an acid is a proton (H⁺) donor, and a base is a proton acceptor.

 

[.ben]

ok i get it now thanks. but what if there were same no. of moles on both sides?

 

[Dreamerish*~]

ok i get it now thanks. but what if there were same no. of moles on both sides?

Then the equilibrium won't be affected by the change in pressure.

 

[.ben]

ok cool thanks.