Answer:
A person's hand holding a cold pack on an ankle ... To determine if a reaction is exothermic or endothermic, you have to compare the ... Well, that also applies to energy of solution problems.
Explanation:
Water is the only one of these that would work by process of elimination.
The way to start it is simply by converting 0.239 L of dinitrogen oxide gas into moles of gas using the ideal gas equation
at STP , 1 mol of gas is 22.4 L of gas, or you could simply use pv = nRT
hope this helps
First, we need to get no.of moles of acetic acid = molarity * volume
= 0.3 m * 0.5 L
= 0.15 moles
then, we need to get no. of moles acetate = molarity *volume
= 0.2m * 0.5L
= 0.1 moles
and we have also to get moles of NaOH = molarity * volume
= 1 m* 0.02L
= 0.02 moles
according to the reaction equation and by using ICE table:
CH3COOH + OH- → CH3COO- + H2O
∴ moles acetic acid = 0.15 - 0.02 = 0.13 moles
when [acetic acid] = moles / total volume
= 0.13 moles / (0.5L + 0.02L)
= 0.25 M
and moles of acetate = 0.1 + 0.02 = 0.12 moles
∴[acetate] = moles / total volume
= 0.12 moles / 0.52L
= 0.23 M
and when we have the value of Ka so we can get the Pka from this formula:
Pka = -㏒ Ka
= -㏒ 1.8 x 10^-5
= 4.7
by using H-H equation we can get the PH:
∵PH = Pka + ㏒[acetate] /[acetic acid]
∴PH = 4.7 + ㏒(0.23 /0.25]
= 4.66