4. A student mistakenly added concentrated (12M)HCI to a sample of unknown, instead of adding 6MHCI, as directed.(1) At first, a large amount of light-colored pre-cipitate formed, but some dissolved on further addi-tion of concentrated HCI. Write an equation(s) for thereaction(s) that might have occurred.(2) The precipitate was separated from thesupernatant liquid in (1) and was found to be insolublein hot water. The precipitate turned grey-black uponaddition of 6M NH2. The student concluded that theunknown contained Hg,2+ ion. The student receivedona low mark on the experiment, because the unknownactually contained all three Group I cations. Explainwhat happened.

A student mistakenly added concentrated (12M) HCI to a sample of unknown, instead of adding 6M HCI,…

Answered: A student mistakenly added conce

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A student mistakenly added conce

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.

Question

4. A student mistakenly added concentrated (12M)
HCI to a sample of unknown, instead of adding 6M
HCI, as directed.
(1) At first, a large amount of light-colored pre-
cipitate formed, but some dissolved on further addi-
tion of concentrated HCI. Write an equation(s) for the
reaction(s) that might have occurred.
(2) The precipitate was separated from the
supernatant liquid in (1) and was found to be insoluble
in hot water. The precipitate turned grey-black upon
addition of 6M NH2. The student concluded that the
unknown contained Hg,2+ ion. The student received
ona low mark on the experiment, because the unknown
actually contained all three Group I cations. Explain
what happened.

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