Chemistry, 21.03.2020 03:24 edmundg2238

To your unknown you add HCl to precipitate the Group A ions (Ag and Hg). This precipitate is removed and NH3 is added to it to redissolve the Ag and check for the presence of Hg. From the picture below which was taken right after the NH3 was added, please select a choice that best represents what you are seeing.

Answers: 3

Show answers

Answers

Answer from: daveankatie1671

Options are not given, however, the following reactions occurs when Group A ions are reacted with HCl followed by NH3

Gray precipitate is seen, which confirms the presence of mercury ions

Explanation:

Selective precipitation is a qualitative analysis, which involves addition of a carefully selected reagents to an aqueous mixture of ions. This results in the precipitation of one or more ions, while leaving the rest in solution. Later, a reaction specific to that ion is carried out separately to determine its identity.

HCl react with both Ag+ and Hg+ ions to form the following precipitates:

Ag+(aq) + Cl-(aq) → AgCl(s)

$Hg_{2}^{2+}$ (aq) + 2Cl- → $Hg_{2}Cl_{2}$ (s)

The precipitate, i.e silver chloride and mercury(I) chloride is removed and solution of NH3 is added.

Silver chloride will dissolve since its forms a soluble complex ion:

AgCl(s) + $2NH_{3}$ (aq) → $Ag(NH_{3})_{2}^{+}(aq) + Cl^{-}(aq)$

However, Mercury(I) chloride will react with ammonia to form a gray solid which is actually a mixture of black mercury and white $AgNH_{2}Cl$ :

$Hg_{2}Cl_{2}$ (s) + $2NH_{3}$ (aq) → Hg(l) + $HgNH_{2}Cl(s) + NH_{4}^{+}(aq) + Cl^{-}(aq)$

The presence of gray solid is the confirmation of the presence of $Hg_{2}^{2+}$ ion

Answer from: Quest

that's just how they are

explanation:

you can't control another persons decisions, all you can do is ask that they respect yours. relationships are hard because you have to put the effort into making sure that another person feels seen, heard, and loved. as time goes on, it gets easier, you learn how to do these things without thinking. loving them becomes as easy as breathing, but every relationship will have fights, and sometimes it'll feel like you're drowning, but as long as you can talk it out and compromise, because that's truly what loving another person is, is compromise, then you'll be okay. movies and tv shows have glamorized and romanticized (pardon the pun) what a relationship would be like. real relationships aren't perfectly timed kisses in the rain, zero fights until one big one ends everything, 6 month anniversaries. real relationships are sleepy confused kisses when one person has to leave for work earlier than the other, real relationships are having small disagreements, real relationships are messy and confusing, real relationships is knowing that even if you're relationship may not last forever and this may not be the person you're going to spend the rest of your life with, that you love them, and you would do anything to see them happy. so yes, relationships are difficult, but so are many other things, relationships can be amazing but also stressful, and not just romantic i'm also talking about platonic relationships (although the primary example here was romantic) sometimes is best to leave friendships behind, so remember, always do whats going to you be happy in the long run.

Answer from: Quest

i believe it is c.) 1575 j.

Another question on Chemistry

Chemistry, 21.06.2019 22:30

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Answers: 1

Answer

Chemistry, 22.06.2019 13:00

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Answers: 1

Answer

Chemistry, 22.06.2019 14:30

What is the relationship between wind and ocean waves? question 17 options: wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves. wind moving at higher speeds will transfer energy over a larger part of the ocean water, resulting in waves with a shorter wavelength. winds moving at higher speeds with cause water to move forward at faster rates, causing larger ocean waves. winds moving at higher speeds will affect deeper water, resulting in waves that move at a faster rate. how do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.

Answers: 2

Answer

Chemistry, 22.06.2019 19:50

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+

Answers: 1

Answer

You know the right answer?

To your unknown you add HCl to precipitate the Group A ions (Ag and Hg). This precipitate is removed...

Questions