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A 10.00-mL aliquot of a commercial algaecide contg. An
organomercury cpd. was treated with conc. HNO3 and
evaporated just to dryness. The residue of mercuric nitrate
was dissolved in dilute HNO3 & diluted to 250.0 mL with
water. A 52.00-mL aliquot of this soln was treated with
20.00 mL of 0.04966 M EDTA & mixed thoroughly for 20
min. After adjusting the pH 10, the x’ss EDTA req’d 18.04
mL of 0.04711 M MgCl2 for titration to the EBT end pt.
Calc. conc. of mercury in the original sample in units of mg
Hg / mL (200.59 g/mol).
organomercury cpd. was treated with conc. HNO3 and
evaporated just to dryness. The residue of mercuric nitrate
was dissolved in dilute HNO3 & diluted to 250.0 mL with
water. A 52.00-mL aliquot of this soln was treated with
20.00 mL of 0.04966 M EDTA & mixed thoroughly for 20
min. After adjusting the pH 10, the x’ss EDTA req’d 18.04
mL of 0.04711 M MgCl2 for titration to the EBT end pt.
Calc. conc. of mercury in the original sample in units of mg
Hg / mL (200.59 g/mol).
If 500g of marble are decomposed completely and knowing that it contains 90% calcium carbonate, calculate the mass of calcium oxide and the volume of carbon dioxide ( at S.T.P.) produced.
What is the mass of hydrochloric acid which reacts with 150 g of Zinc, which has a 95% Purity.
A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample underwent precipitation using BaCl2 and was digested for overnight. The precipitate was then filtered off to obtain white crystalline precipitate that was collected in an ash less filter paper. In performing constant weighing, he obtained a crucible mass that is 29.9442 g. After burning his samples inside the crucible, the obtained mass was 30.3375 g. Compute for the experimental mass (g) of SO3 in grams obtained by the student
A solution has a [OH–] of 2.5 x 10–7M, what colour would it be if it was mixed with the indicator phenol red?
Calculate the pKa and Ka of the indicator Orange IV.
Indicator - Thymol Blue, Phenol Red, Alizarin Yellow
Colour Observed - Blue, Red, Yellow
Select two indicators that, when combined, will produce a solution which is yellow at pH 3.0, green at pH 5.8, and blue at pH 10.0.
Colour Observed - Blue, Red, Yellow
Select two indicators that, when combined, will produce a solution which is yellow at pH 3.0, green at pH 5.8, and blue at pH 10.0.
Indicator - Thymol Blue, Phenol Red, Alizarin Yellow
Colour Observed - Blue, Red, Yellow
A solution of unknown [H3O+] is mixed several indicators and the results are shown: What is the approximate pH range of the solution?
Colour Observed - Blue, Red, Yellow
A solution of unknown [H3O+] is mixed several indicators and the results are shown: What is the approximate pH range of the solution?
Find the pH of a green solution of bromcresol green.
What would be the pressure of a gas, at 101.3 kPa, if the temperature is lowered from 368 K to 358 K?
