# chemistry

How would you make up 255 mL of 0.150 M HNO3 from nitric acid that is 68.0% HNO3?
The density of 68.0% HNO3 is 1.41 g/mL.

1. 👍 0
2. 👎 0
3. 👁 57
asked by Henry
1. bump
someone help me on this plox??

1. 👍 0
2. 👎 0
posted by Henry
2. Supposing the "68%" is 68% by weight:
(0.255 L) x (0.150 mol/L) x (63.0130 g/mol) / 0.680 / (1.41 g/ml) = 2.51 ml
The direct way would be to take 2.51 ml of the 68% solution and dilute it to exactly 255 mL.
But as a practical matter, since measuring 2.51 mL accurately might be difficult, it would be useful to make an intermediate dilution of something like 10 to 1, and use the diluted solution to make up the 255 ml of desired concentration.

1. 👍 0
2. 👎 0
3. I agree with the answer by james but I would like to point out two or three things. First, the percent IS by weight. Second, the 68% is never EXACTLY 68%. Third, since you can't easily measure out 2.51 mL AND you can't easily measure out a final solution of 255 mL (and the 68% is just a close 68%), the best you can do is come close to 0.150 M. I realize this is just a practice problem but I wanted to add this information.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Science

Traffic in the cities releases NOx gases into the atmosphere (in the form of NO and NO2). NOx gases contribute to rainwater acidification by dissolving and transforming into a strong acid (HNO3, nitric acid) according to the

asked by karem on December 21, 2016
2. ### chemistry

A commercial sample of concentrated aqueous nitric acid (HNO3) is 18.2% nitric acid base mass and has a density of 1.12 g/mL. (a) What is the molarity (M) of the HNO3 solution? (b) What is the molality (m) of the HNO3 solution?

asked by Sarah on January 21, 2009
3. ### chemistry

In an acid base titration,25.0 ml of nitric acid, HNO3, were neautralized by 28.0 mL of 0.209 mol/L calcium hydroxide, Ca(OH)2. What is the concentration of the nitric acid?

asked by Mindu on January 12, 2015
4. ### chem

How many grams of nitric acid(HNO3) will be produced when 0.51 mol of dinitrogen pentoxide reacts with water to form nitric acid?

asked by megan on March 7, 2008
5. ### chemistry

Nitric acid is a strong acid. Does this mean that a) HNO3 dissociates completely to H+ (aq) and NO3 ^1- (aq) when it dissolves in water OR b) aqueous solutions of HNO3 contain equal concentrations of H+(aq) and OH- (aq) Thank you!

asked by someone on February 24, 2010
6. ### AP Chemistry

Nitric acid is a strong acid. Does this mean that a) HNO3 dissociates completely to H+ (aq) and NO3 ^1- (aq) when it dissolves in water OR b) aqueous solutions of HNO3 contain equal concentrations of H+(aq) and OH- (aq) Thank you!

asked by DrBob222 fan :) on February 24, 2010
7. ### Chemistry

How many resonance structures do these following acids have? H2CO3-carbonic acid H3PO4-phosphoric acid H2SO4-sulfuric acid HNO3-nitric acid CH3COOH- acetic acid CH2ClCOOH- chloroacetic acid CHCl2COOH- dichloroacetic acid CCl3COOH-

asked by Joseph on November 4, 2014
8. ### Chemistry

How to make 10% nitric acid? wouldnt it be 10 mL nitric acid + 100 mL of solvent, making it 10%? What molarity is used it to make 10% nitric acid?

asked by Merlina_Lyn on February 3, 2013
9. ### chemistry

The density of 19.0% by mass of nitric acid, HNO3 is 1.11 g cm-3. Calculate the volume (dm3) of acid needed to prepare 2.00 dm3 of 3.00 mol dm-3 HNO3 solution. (FW HNO3 = 63 g/mol)

asked by h on March 28, 2014
10. ### Chemistry

You have .5g of copper. If the nitric acid is 16 M HNO3, how many milliliters of nitric acid will react exactly with that amount of copper. I know that when I get that volume I will triple it so that there will be excess acid and

asked by Morgan on February 25, 2013

More Similar Questions