quiz 9 sec 3

4gm of impure NaCl is dissolved in water and added for it excess amount of AgNO₃ the 9.25g is precipitated from silver chloride the percentage of Cl in pure sample is ….

• 30.5%

• 60%

• 55.4%

• 57.2%

1.41g sample of sodium carbonate contains impurities of sodium chloride, 3mL od 0.5M hydrochloric acid are added to it, and to neutralize the remaining uncreated portion of the acid, 15mL of 0.4M sodium hydroxide solution are used ….

What is the percentage of sodium chloride in the sample?

• 43.27%

• 56.77%

• 86.54%

• 90.24%

The impurities represents 50% of the mass of a sample (X) of sodium chloride salt, When this sample is dissolved in water to form a solution, then excess of silver nitrate solution is added to it, 8.5g of a precipitate are formed …

What is the mass of the sample (X)?

• 6.93g

• 7.2g

• 8g

• 10g

by dilution of 100 ml of 1.2 M NaNO₃ solution by adding water till reaching the triple of its original volume, the produced concentration equals ……….

• 0.2M

• 0.4M

• 0.3M

• 0.5M

100 ml from solution 0.2 M of NaOH added to 200 ml from acid solution of HCl 0.1 M the result solution is …. after mixing

• alkaline

• neutral

• basic

• acidic

1.41g sample of sodium carbonate contains impurities of sodium chloride, 3mL od 0.5M hydrochloric acid are added to it, and to neutralize the remaining uncreated portion of the acid, 15mL of 0.4M sodium hydroxide solution are used ….

What is the percentage of sodium chloride in the sample?

• 43.27%

• 56.77%

• 86.54%

• 90.24%

20.95 mL of 1M hydrochloric acid are used as a saturated solution in the titration of 1.113g of sodium carbonate to determine its degree of purity … What is the percentage of the purity of sodium carbonate?

• 98.7%

• 99%

• 99.76%

• 97.8%

The resulting solution from mixing 0.5L from solution of HCl its concentration 0.4M to some volume from caustic soda its concentration 0.2M is ………

• acidic and its concentration 0.2M

• acidic and its concentration 0.1M

• Alkaline and its concentration 0.2M

• Alkaline and its concentration 0.1M

What is the volume of 0.05M H₂SO₄ acid required to completely neutralize 80 mL of 0.13M NaOH solution?

• 104mL

• 52mL

• 26mL

• 10.4mL

What is the volume of 0.1M HCl acid required for the complete reaction with 1g of pure calcium carbonate?

• 100 mL

• 150 mL

• 200 mL

• 250 mL