Explanation:
Used to separate one reactant or product from another
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Answer:
Explanation:
CH₃CHOHCOOH ⇄ CH₃CHOHCOO⁻ + H⁺
ionisation constant = 1.36 x 10⁻⁴ .
molecular weight of lactic acid = 90 g
moles of acid used = 20 / 90
= .2222
it is dissolved in one litre so molar concentration of lactic acid formed
C = .2222M
Let n be the fraction of moles ionised
CH₃CHOHCOOH ⇄ CH₃CHOHCOO⁻ + H⁺
C - nC nC nC
By definition of ionisation constant Ka
Ka = nC x nC / C - nC
= n²C ( neglecting n in the denominator )
n² x .2222 = 1.36 x 10⁻⁴
n = 2.47 x 10⁻²
nC = 2.47 x 10⁻² x .2222
= 5.5 x 10⁻³
So concentration of hydrogen or hydronium ion = 5.5 x 10⁻³ g ion per litre .
The equation that correctly represent the reaction for formation of ammonia is
N2+ 3H2 → 2NH3 (answer D)
1 mole of nitrogen gas (N2) react with 3 moles of hydrogen gas (H2) to form 2 moles of ammonia ( NH3). This is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. The process is exothermic hence energy is released.
