Calculate the concentration of Hg2+ ions in a saturated solution of HgS(s). How many Hg^2+ ions are in 1000 L of the solution.

The concentration of   is  

The number of ion  is  

Explanation:

Generally the solubility product constant of HgS(s)  is  

    This  solubility product constant is mathematically represented as

Since the HgS is saturated it implies that the concentration of sulfur ion is the same as that of mercury ion s

=>    

=>  

substituting values

=>  

From above mole of  is equal to 1 L

Then x mole of   will be equal to 1000 L

 Therefore

=>                        

Now the number of   ions are in 1000 L of the solution is mathematically represented as

Where is the avogadro's constant which has a value of  

 Substituting value

the answer would be c

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).