Question

A mixture of NaOH and Na2CO3 required 25mL of 0.1 M HCl using phenolphthalein as indicator. However, the same amount of the mixture required 30mL of 0.1 M HCl when methyl orange was used as the indicator. The molar ratio of NaOH and Na2CO3 in the mixture was

Solution

Correct option is

4 : 1

 

Phenolphthalein gives the end point corresponding to the reactions

Methyl orange gives the end point corresponding to the reactions:

 

SIMILAR QUESTIONS

Q1

Solution A and B of H2SO4 have respective molarities to be 5.0 and 1.0 In order to prepare 10L of 8 N H2SO4, what volumes of A and B solutions need be mixed?

Q2

You are given 1 L of 2 N H2SO4 and 1 L 5 N H2SO4. What will be the maximum volume of 1.5 M H2SOthat you can prepare from these two solutions?

Q3

5 mol of mixture of Mohr’s salt and Fe2(SO4)3 requires 500mL of MK2Cr2O7 for complete oxidation in acidic medium. The mole % of the Mohr’s salt in the mixture is

Q4

For the reaction : 2H3PO2 → H3PO4 +PH3 , the equilvant mass of H3PO2 is

Q5

1 mole of equimolar mixture of ferric oxalate and ferrous oxalate will require x mol of KMnO4 in acidic medium for complete oxidation. is

Q6

If g is the mass of NaHC2O4 required to neutralize 100 mL of 0.2 MNaOH and y g that required to reduce 100 mL of 0.02 KMnO4 in acidic medium, then

Q7

A mixture of K2C2O4 and KHC2O4 required equal volumes of 0.1 M K2Cr2O7 for oxidation and 0.1 M NaOH for neutralization in separate titrations. The molar ratio of K2C2O4 and KHC2O4 in the mixture is :

Q8

An equilmolar mixture of Na2C2O4 and H2C2O4 required V1L of 0.1 M KMnO4 in acidic medium for complete oxidation. The same amount of the mixture required V2L of 0.1 M NaOH for neutralization. The ratio of V1 to V2 is

Q9

 

In an iodometric estimation, the following reactions occur

0.15 mol of CuSO4 of 80% purity was added to excess of KI solution and the liberated iodine required 12 mL 120mL of hypo. The molarity of hypo solution was

Q10

A 1.70 g sample of H2O2 solution containing x% H2O2 by mass requires xmL of KMnO4 solution for complete oxidation under acidic condition. The molarity of KMnO4 solution is