mol/L
Molarity indicates the number of moles of solute per liter of solution.
Answer:
b) pH = 9.25
Explanation:
- NH4+(aq) + H2O(l) ↔ NH3(aq) + H3O+(aq)
- NH3 + H2O ↔ NH4+ + OH-
- 2 H2O ↔ H3O+ + OH-
⇒ Kb = [ NH4+ ] * [ OH- ] / [ NH3 ] = 1.86 E-5......from literature
mass balance NH4+:
⇒ M NH4+ = [ NH4+ ] - [ OH- ]
∴ [ NH3 ] ≅ M NH4+ = 0.26 M
⇒ Kb = (( 0.26 + [ OH- ] )) * [ OH- ] / 0.26 = 1.86 E-5
⇒ 0.26 [ OH-] + [ OH- ]² = 4.836 E-6
⇒ [ OH- ]² + 0.26 [ OH- ] - 4.836 E-6 = 0
⇒ [ OH- ] = 1.859 E-5 M
⇒ pOH = - Log ( 1.859 E-5 )
⇒ pOH = 4.7305
⇒ pH = 14 - pOH = 9.269
Answer:steeper
Explanation:if it was me thats what i would pick
Usually when it rains the worms surface!
HOPE THIS HELPS!
Answer:
200g of NaOH
Explanation:
The following data were obtained from the question:
Molar mass of NaOH = 40g/mol
Volume = 500mL
Molarity of NaOH = 10M
Next, we shall determine the number of mole of NaOH present in the solution. This is illustrated below:
Molarity of NaOH = 10M
Volume = 500mL = 500/1000 = 0.5L
Mole of NaOH =...?
Molarity = mole /Volume
10 = mole /0.5
Cross multiply
Mole = 10 x 0.5
Mole of NaOH = 5 moles
Finally, we can convert 5 moles of NaOH to grams. This is illustrated below:
Molar mass of NaOH = 40g/mol
Mole of NaOH = 5 moles
Mass of NaOH =...?
Mole = Mass /Molar Mass
5 = Mass /40
Cross multiply
Mass = 5 x 40
Mass of NaOH = 200g
Therefore, 200g of NaOH is needed to prepare the solution.
