When a weak acid ( HA ) is titrated with a strong base, such as NaOH what species are decreasing in concentration before the equivalence point is reached? Na + Na + and A − A − HA HA and H + H + ( H 3 O + ) ( H 3 O + ) Na + Na + and OH − OH − HA HA and A − A −

HA and A-

Explanation:

before the equivalence point, there is a HA/A- buffer solution by wich the pH is calculated.

Therefore, the species that decrease their concentration before the equivalence point are HA and A-

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation:

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.