Question

You have a sample of sulfuric acid with an unknown concentration and you perform a titration with sodium hydroxide to determine the concentration.

Your titration data for one trial is below:

Initial burette reading (cm3)
10.20

Final burette reading (cm3)
20.55
The volume of acid used in each titration is 10.00 cm3 and the concentration of NaOH used is 0.1000 mol dm−3.

Determine the concentration of the sulfuric acid in mol dm−3. Round your answer to four significant figures

Answer 1

Answer:

[10/23, 11:19 PM] Naila: muru tho dekha

[10/23, 11:20 PM] Naila: Itha suloo chalara kon hai pucha

Answer 2

Answer: 5

Explanation: I had the same problem in my chem class, Q was being difficult for no reason, but once I got it, it wasnt too bad. Here step by step-

<They give you>                

-Sulfuric Acid (H₂SO₄)

-Sodium Hydroxide (NaOH)

-Concentration of NaOH 0.1000 mol dm-³

-Volume of acid used 10.00 cm³

<Dont Know>

-Concentration of Sulfuric Acid

So what you wanna do here is to make whats given into mols, whenever you dont know something, always mols GOLDEN RULE. Once you do that even if you dont know concentration or whatever for other molecules in the equation, you can use mol rations to find the concentration of other molecules.

1) Make your formula

   -To make things look easier, make a formula

H₂SO₄ + NaOH = H₂O + NaSO₄

So here, you just have your sulfuric acid and the Sodium Hydroxide

-Its an acid and base reaction, and whenever you have one the product is gonna be water and a salt. Therefore H₂O = water and the salt NaSO₄

Step 2) Balance the equation

I dont wanna explain all of this, you just do it, look at both sides- balance it, not too bad, a lil bit, not impossible

Becomes H₂SO₄ + (2)NaOH= (2)H₂O + (2)NaSO₄

Step 3) Conversions

Now that you have it all balanced, you can try to find the mol of one of the compounds. The question gives you the concentration of Sodium Hydroxide so we work with that.

Important formula : Concentration = mol / volume

They give you concentration and volume, so just plug and play.

One more, you gotta convert dm-³ to cm, all you do is divide by 1000.

So Volume of 10.00 cm and 0.1 mol dm-³ concentration- work with these

0.1 dm-³ = 0.0001 cm³

Again just plug into the equation I have above.

0.0001 x 10 = 0.001 mol

Hey, now you have the mol for one of the compounds, NaOH

Since in the balanced equation above, the coefficients for Sulfuric acid to NaOH was 1:2, you can use this for your benefit of finding the mol of Sulfuric Acid. If NaOH has a ratio of 2 with 0.001 mol, what is the mol of Sulfuric Acid that has a ratio of 1?

EZ, all you do is 0.001 / 2 = 0.05

Now find the concentration of Sulfuric Acid.

You have the mol, 0.05, gotta put into the formula

0.05/10 = Concentration

0.005 mol cm³

But since dm-³=1000xcm³

They want dm-³

0.005 x 1000 = 5

I think this is how you do it-

5.000