HCl (aq) + NaOH (aq)→ NaCl (aq) + H2O (l)A 52.00 mL solution of HCl was titrated with a 0.20 M NaOH solution. The end point was reached at 97.00 mL after titrating with NaOH. 1.)What is the initial molarity of HCl?

2.)What is the pH after 12.00 mL of NaOH is added?

3.)What is the pH after 65.00 mL of NaOH is added?

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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