Nitric acid is usually purchased in a concentrated form that is 70.3% hno3 by mass and has a density of 1.41 g/ml. how much concentrated solution would you take to prepare 1.15 l of 0.115m hno3 by mixing with water?

to prepare a 0.115 M HNO3 solution, 11.85 mL of the concentrate solution is needed and water is added until the desired volume of 1.15 L is reached

Explanation:

%w/w = 70.3% = g HNO3/g sln * 100

⇒ 0.703 = g HNO3/g sln

let g sln = 1000g:

⇒ g HNO3 = 0.703 * 1000g = 703g HNO3

⇒ mol HNO3 = 703g * ( mol/63.01g HNO3) = 11.157 mol HNO3

for 1 L of solution:

⇒ C HNO3 = 11.157 mol/ L

dilution formula:

∴ C1= 11.157 mol/L

∴ C2 = 0.115 mol/L

∴ V2 = 1.15 L

⇒ V1 = V2*C2 / C1

⇒ V1 = ((1.15 L)*(0.115 mol/L)) / 11.157 mol/L

⇒ V1 = 0.01185 L (11.85 mL)

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).