Need help with some chemistry homework questions (1 Viewer)

[Dane Red]

 

[jimmysmith560]

Would the following help with the question in the first attachment?











Moles of remaining ions and solids:

 

[Eagle Mum]

@Dane Red, regarding comments in another thread, would any further explanation for Q1 be useful?

 

[Eagle Mum]

Q2 requires a little bit of general knowledge about the pH of various solutions (I don’t know if these are described as part of the curriculum).

HCl is a strong acid (red)
Ammonia is a relatively strong base when dissolved in water (yellow)
Lemon is a weak acid (orange)
Baking soda which is a weak base is commonly used as an oven cleaner (yellow)
Pure water is neutral (yellow)

if you arrange these in order of increasing pH:
Strong acid - red
Weak acid - orange
Neutral pH - yellow
Weak base - yellow
Strong base - yellow

Therefore this flower solution changes colour (from yellow through orange to red) as pH decreases (becomes more acidic), but doesn’t change at all as pH increases from neutral to alkaline.
The solution is a good/useful acid pH indicator but useless as a basic/alkali indicator.

 

[Dane Red]

Would the following help with the question in the first attachment?











Moles of remaining ions and solids:

What was the formula that you used here

 

[Masaken]

What was the formula that you used here
View attachment 37639

that formula is n=cV (number of moles = concentration in mol/L times volume in litres) - this formula is from mod 2

 

[Eagle Mum]

What was the formula that you used here
View attachment 37639

It’s the formula to calculate how many moles of silver (as ions in the silver nitrate solution) there are in the initial solution, by multiplying the volume of the solution (0.100L) by the concentration of silver nitrate (1.00 mol/L).

 

[Dane Red]

that formula is n=cV (number of moles = concentration in mol/L times volume in litres) - this formula is from mod 2

How could i forget that, but anyway thanks for clarifying