4. (2 Points) How many grams of oxalic acid dihydrate H2C2O4 -> 2H2O, a diprotic acid, are needed to react with 20.00 mL of 0.4500 M NaOH.

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24-11-2018
Chemistry

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4. (2 Points) How many grams of oxalic acid dihydrate H2C2O4 -> 2H2O, a diprotic acid, are needed to react with 20.00 mL of 0.4500 M NaOH.

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kenmyna kenmyna · Answer 1 · 2018-12-03T05:56:12+01:00

The number of grams of oxalic acid dihydrate that are needed to react with 20.00 ml of 0.4500 M NaOH is 0.567 grams

calculation

Step 1: write the equation for reaction

H2C2 O4 . 2H2O + 2 NaOH → Na2C2O4 + 4 H2O

Step 2: calculate the moles of NaOH

moles = molarity x volume in liters

volume in liters = 20.00/1000 =0.0200 L

molarity =0.4500 M = 0.4500 mol/l

moles = 0.4500 mol/l x 0.0200 L =0.0090 moles

Step 3: use the mole ratio to calculate the of oxalic acid dihydrate

that is H2 C2O4: NaOH is 1:2 therefore the moles of H2C2O4.2H2O

=0.0090 moles x 1/2 =0.0045 moles

Step 4: calculate the mass of H2C2O4.2H2O

mass= moles x molar mass

the molar mass of H2C2O4.2H2O = (1x2)+ (12 x2) + (16 x4) + 2(18) =126 g/mol

mass =0.0045 moles x 126 g/mol =0.567 grams

nikitarahangdaleVT nikitarahangdaleVT · Answer 2 · 2022-03-23T16:44:14+01:00

0.567 grams of oxalic acid dihydrate, a diprotic acid are needed to react with 20.00 mL of 0.4500 M NaOH.

How we calculate mass of any substance from moles?

Mass of any substance will be calculated by using moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is :
H₂C₂O₄.2H₂O + 2NaOH → Na₂C₂O₄ + 4H₂O

Moles of NaOH can be calculated by using the below formulas:

M = n/V

n = 0.4500M / 0.020L = 0.0090 moles

From the stoichiometry of the reaction it is clear that:

2 moles of NaOH = react with 1 mole of H₂C₂O₄.2H₂O

0.0090 moles of NaOH = react with 1/2×0.0090=0.0045moles of H₂C₂O₄.2H₂O

Mass of H₂C₂O₄.2H₂O will be calculated by using the above formula of moles as:

Mass = 0.0045 mol × 126 g/mol = 0.567 grams

Hence, 0.567 grams is the required mass.

To know more about moles, visit the below link:

https://brainly.com/question/26092247