Oxalic acid, H_2C_2O_4 (aq), is often sold as wood bleach and can be used to rem

Question

Oxalic acid, H_2C_2O_4 (aq), is often sold as wood bleach and can be used to remove rust. A student wanted to remove rust from an old bike chain and prepared the solution by dissolving 1/8th of a cup of solid oxalic acid in 0.720 gal of hot tap water. The student then analyzed a 10.00 mL sample of the oxalic acid solution, required 28.39 mL of a 0.1550M NaOH solution for complete neutralization. Predict the products and balance the equation below, then calculate the molarity of the oxalic acid solution: H_2C_2O_4(aq) + NaOH(aq) rightarrow The active ingredient in Turns is often calcium carbonate, and Turns Extra Strength often contains 750 mg of calcium carbonate. If stomach acid is primarily hydrochloric and with an approximate molarity of 1.0M calculate the volume (in mL) of stomach acid that can be neutralized by taking two Tums Extra Strength tablets. (Assume the amount of calcium carbonate in the Tums is 750 plusminus 0.05 mg of calcium carbonate.) Write the balanced equation for the reaction below

Explanation / Answer

5) The balanced equation is

    H2C2O4 + 2 NaOH   ---------------->   Na2C2O4 + 2H2O

H2C2O4:

M1 = ?

V1 = 10 mL

n1 = moles in the balanced equation = 1

NaOH:

   M2 = 0.155 M

V2 = 28.39 mL

n2 = moles in the balanced equation = 2

Then,

at equivalence point    M1V1/n1 = M2V2/n2

                                 M1 = (M2V2/n2) x (n1/V1)

                                      = (0.155 M x 28.39 mL/2) x (1/10 mL)

                                     = 0.22 M

                               M1 = 0.22 M

Therefore,

Molarity of the oxalic acid = 0.22 M

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