Question

Вычислите массу 10%-ного раствора гидроксида натрия необходимого для полной нейтрализации раствора содержащего 4, 9 грамма серной кислоты

Answer 1

H2SO4+2NaOH=Na2SO4+2H2O
Mr(H2SO4)=98г/моль
n(H2SO4)=m/Mr 4,9/98=0,05моль
По уравнению реакции на 1 моль кислоты 2мольNaOH а на 0,05 моль идет 0,05*2=0,1мольNaOH
Mr(NaOH)=40г/моль m(NaOH)=0,1*40=4гр
М р-ра= масса вещества/w 4/0,1= 40 гр

Answer 2

Calculating the Mass of 10% Sodium Hydroxide Solution Needed for Neutralizing Sulfuric Acid

To calculate the mass of a 10% sodium hydroxide solution needed to neutralize a solution containing 4.9 grams of sulfuric acid, we can use the following steps:

1. Determine the Molar Mass of Sulfuric Acid (H2SO4) - The molar mass of sulfuric acid (H2SO4) is 98.08 g/mol.

2. Determine the Molar Ratio of Sulfuric Acid to Sodium Hydroxide - The balanced chemical equation for the neutralization reaction between sulfuric acid and sodium hydroxide is: `H2SO4 + 2NaOH → Na2SO4 + 2H2O` - This equation shows that 1 mole of sulfuric acid reacts with 2 moles of sodium hydroxide.

3. Calculate the Amount of Sodium Hydroxide Needed - Using the molar ratio, we can calculate the amount of sodium hydroxide needed to neutralize 4.9 grams of sulfuric acid.

4. Convert the Amount of Sodium Hydroxide to a 10% Solution - Once we have the amount of sodium hydroxide needed, we can convert it to a 10% solution.

Calculation Steps

1. Molar Amount of Sulfuric Acid - The molar amount of sulfuric acid can be calculated using the formula: `moles = mass / molar mass` - Substituting the given mass of sulfuric acid (4.9 grams) and its molar mass (98.08 g/mol): `moles = 4.9 / 98.08 = 0.05 moles`

2. Molar Amount of Sodium Hydroxide Needed - Since the molar ratio of sulfuric acid to sodium hydroxide is 1:2, the molar amount of sodium hydroxide needed is twice the molar amount of sulfuric acid: `moles of NaOH = 2 * moles of H2SO4 = 2 * 0.05 = 0.1 moles`

3. Mass of 10% Sodium Hydroxide Solution - The mass of the 10% sodium hydroxide solution can be calculated using the formula: `mass = (volume of solution) * (density of solution)` - Given that the density of the 10% sodium hydroxide solution is 1.44 g/cm^3 we can calculate the volume of the solution and then determine the mass.

4. Final Calculation - The final calculation will provide the mass of the 10% sodium hydroxide solution needed to neutralize the given amount of sulfuric acid.

Let's proceed with the final calculation.