Questions by PasqualePurv

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1 answer 65 views

What is the concentration of a copper (II) sulfate solution if its absorbance value at 620 nm is 0.45? Use a standard calibration curve with known concentrations of copper (II) sulfate and their corresponding absorbance values to determine the unknown concentration of the solution using colorimetry.

asked 6 days ago in Analytical Chemistry

+1 vote

1 answer 64 views

A chemistry student needs to quantify the amount of iron (II) ions in a sample using colorimetry. The sample was prepared by dissolving a known mass of iron (II) sulfate in water, and the solution was diluted to a known volume. The student needs to determine the concentration of iron (II) ions in the original solution by measuring the absorbance of the sample using a colorimeter, and then using calibration curves to convert the absorbance to concentration. The student also needs to calculate the percentage error of the experiment and suggest ways to improve the accuracy of the results.

asked Jan 22 in Analytical Chemistry

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1 answer 27 views

Where does meta-analysis fit in the hierarchy of evidence?

asked Jan 16 in Psychology

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1 answer 7 views

When evaluating the trauma model of grief, what weakness can be pointed out?

asked Jan 15 in Psychology

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1 answer 37 views

What is the definition of 'self-esteem'?

asked Jan 13 in Psychology

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1 answer 41 views

What begins when an oogonium with the diploid number of chromosomes undergoes mitosis?

asked Jan 6 in Science

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1 answer 51 views

Squamata is the largest order of what broad animal group, and includes lizards and snakes?

asked Dec 31, 2024 in Science

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1 answer 14 views

Mercury and lead, which was once widely used in paint and gasoline, are examples of what type of metals?

asked Dec 31, 2024 in Science

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1 answer 15 views

Cells infected with viruses secrete what example of early induced proteins, which travel to adjacent cells and induce them to make antiviral proteins, a sacrifice that protects the surrounding cells?

asked Dec 30, 2024 in Science

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1 answer 27 views

Bromide is present in brines, which are naturally occurring solutions of what?

asked Dec 30, 2024 in Science

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1 answer 19 views

When a seed is produced by apomixis, the embryo develops without what?

asked Dec 27, 2024 in Science

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