Identify the species that was reduced in the titration reaction shown below. Justify your answer in terms of oxidation numbers.
6H+(aq)+2MnO4−(aq)+5H2C2O4(aq)→10CO 2(g)+8H2O(l)+2Mn2+(aq)

MnO₄⁻ is species reduced as manganese gains 5e⁻ and is reduced to Mn⁺²

Explanation:

MnO₄⁻ + 5e⁻ => Mn⁺²

Mn + 4O = -1

Mn + 2(-2) = - 1

Mn = +7

Mn = +7 gains 5e⁻ => Mn = +2

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j