A 1.025 g sample containing a weak acid HX (mol. Mass=82) is dissolved in 60 mL. water and titrated with 0.25 M NaOH. When half of the acid was neutralised the pH was found to be 5.0 and at the equivalence point the pH is 9.0. Calculate mass precentage of HX in sample :
A 20.0 mL sample of a 0.20 M solution of the weak diprotic acid H_(2)A is titrated with 0.250 M NaOH. The concentration of solution at the second equivalent point is:
A sample containing HAsO_2 (mol. mass =180 ) and weighing 3.78g is dissolved and diluted to 250mL in a volumetric flask. A 50mL sample (aliquat) is withdrawn with a pipet and titrated with 35mL of 0.05 M solution of I_2 . Calculate the percentage HAsO_2 in the sample :
6.0 g weak acid HA (mol.mass=60 g/mol.) is dissolved in water and formed 10 m^(3) solution. If K_(a)(HA)=10^(-9), then pOH of solution is : [Given: log 4=0.6]
A sample of NaOH weighing 0.38 g is dissolved in water and solution is made to 50.0 mL in a volumetric flask. What is the molarity of the solution?
A sample of pure sodium carbonate 0.318g is dissolved in water and titrated with HCl solution. A volume of 60mL is required to reach the methyl orange end point. Calculate the molarity of the acid.
0.45 g of acid (mol. Wt. =90 ) was exactly neutralized by 20 ml of 0.5(M) NaOH . The basicity of the given acid is
4.0 g of NaOH and 4.9 g of H_(2)SO_(4) are dissolved in water and volume is made upto 250 mL. The pH of this solution is:
A solution of weak acid HA was titrated with base NaOH. The equivalent point was reached when 40 mL. Of 0.1 M NaOH has been added. Now 20 mL of 0.1 M HCl were added to titrated solution, the pH was found to be 5.0 What will be the pH of the solution obtained by mixing 20 mL of 0.2 M NaOH and 20 mL of 0.2 M HA?
0.45g of an acid of mol. Mass 90 was neutralised by 20mL of 0.5 N caustic potash (KOH) . The basicity of acid is :
5 g sample contain only Na_(2)CO_(3) and Na_(2)SO_(4) . This sample is dissolved and the volume made up to 250 mL. 25 mL of this solution neutralizes 20 mL of 0.1 M H_(2)SO_(4) . Calcalute the % of Na_(2)SO_(4) in the sample .
NARENDRA AWASTHI-IONIC EEQUILIBRIUM-Assertin-Reason Type Questions
