Acidul HClO 4 este un acid tare. a)Scrieti ecuaţia procesului de ionizare în soluţie apoasă

b)Calculaţi concentraţia ionilor hidroniu din soluţie, ştiind că s-au preparat

200 mL soluţie plecând de la 20,1 g acid percloric.

c)Determinaţi pH-ulsoluţiei.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

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

the answer is b. dilution