## Computing percentage concentration of H2SO4

Chemistry and homework help forum.

Organic Chemistry, Analytical Chemistry, Biochemistry, Physical Chemistry, Computational Chemistry, Theoretical Chemistry, High School Chemistry, Colledge Chemistry and University Chemistry Forum.

Share your chemistry ideas, discuss chemical problems, ask for help with scientific chemistry questions, inspire others by your chemistry vision!

Please feel free to start a scientific chemistry discussion here!

Discuss chemistry homework problems with experts!

Ask for help with chemical questions and help others with your chemistry knowledge!

Moderators: expert, ChenBeier, Xen

Dhamnekar Winod
Sr. Member
Posts: 35
Joined: Sat Nov 21, 2020 10:14 am
Location: Mumbai[Bombay],Maharashtra State,India

### Computing percentage concentration of H2SO4

175.0 g pure $$H_2O$$ was placed in a beaker and thereafter 9.80 g pure $$H_2SO_4$$ was added and stirred. What is the total volume of the solution and what is the percentage concentration of $$H_2SO_4$$ in the solution?

My answer: 1.0 ml= 1.0 g $$H_2O$$ Hence 175.0 g pure$$H_2O$$=175.0 ml$$H_2O$$
9.80 g $$H_2SO_4$$=5.36 ml because density of $$H_2SO_4$$ is $$1.8302 g/cm^3$$

Hence total volume of the solution= 175 +5.36 =180.36 ml and % conc. of $$H_2SO_4= \frac{5.36}{180.36}=2.97$$%

Last edited by Dhamnekar Winod on Thu Jan 28, 2021 9:44 am, edited 1 time in total.
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
ChenBeier
Distinguished Member
Posts: 537
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Computing percentage concentration of H2SO4

No, because percentage of acids are mass percentage. It is V1 + V2 not equal sum volume. It is 9,8 g/(175g +9,8g)*100% = 5,3%w.w

To get the volume you need specific gravity of the 5.3% acid.
Dhamnekar Winod
Sr. Member
Posts: 35
Joined: Sat Nov 21, 2020 10:14 am
Location: Mumbai[Bombay],Maharashtra State,India

### Re: Computing percentage concentration of H2SO4

How to compute specific gravity of 5.3 % w/w $$H_2SO_4 ?$$ I know specific gravity =$$\frac{density_{substance}}{density_{water}}$$

Density of water=1.
Density of $$H_2SO_4=1.8302/cm^3$$

How to use specific gravity of 5.3% w/w $$H_2SO_4$$ for computing volume of the solution?
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
ChenBeier
Distinguished Member
Posts: 537
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Computing percentage concentration of H2SO4

This you cannot compute. This you have to look up in a table book. Because volumes of the most compounds are not additative. During mixing you get volume contraction.

https://www.mt.com/dam/mt_ext_files/Edi ... _e_gif.gif