What is the concentration of hydrogen ions [h+] in a solution of ph = 4.0?
1 × 104m
4 × 10–4m
2 × 10–2m
1 × 10–4m

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxide ion concentration.

Given: pH= 4.0

Putting in the values in the given equation:

Thus concentration of hydrogen ions [H+] in a solution of pH = 4.0 is

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.