1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nikitich [7]
3 years ago
8

Suppose an EPA chemist tests a 250.0 ml sample of groundwater known to be contaminated with nickel(II) chloride, which would rea

ct with silver nitrate solution like this:
NiCl_2(aq) + 2AgNO_3 (aq) -------> AgCl (s) + Ni(NO_3)_2 (aq)
The chemist adds 58.0m silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected of 3.6 mg of silver chloride.
1. Calculate the concentration of nickel(II) chloride contaminant in the original groundwater sample. Round your answer to 2 significant digits.
Chemistry
1 answer:
nataly862011 [7]3 years ago
6 0

Answer:

0.05 mM

Explanation:

NiCl_2(aq) + 2AgNO_3 (aq) -------> 2 AgCl (s) + Ni(NO_3)_2 (aq)

Molar mass of  NiCl_2 = 129.5994 g/mol

Molar mass of AgNO_3 = 169.87 g/mol

Molar mass of AgCl = 143.32 g/mol

The chemist added 58mM of silver nitrate = 58 / 1000 = 0.058 M

mass of silver nitrate present =0.058 × 169.87 = 9.85246 g

according to the equation of reaction

2 mole of silver nitrate is needed to produce 2 mole of silver chloride  

2 mole of silver nitrate = 339.74 g

2 mole of silver chloride = 286.64 g

339.74 g silver nitrate  produces 286.64 g silver chloride

unknown mass of silver nitrate produce 0.0036 g

unknown mass of silver nitrate = 339.74 × 0.0036 / 286.64 = 0.00427 g

then

1 mole of NiCl_2 reacts 2 mole of AgNO_3

129.5994 g of NiCl_2 react with 339.74 g AgNO_3

unknown mass of NiCl_2  react with  0.00427 g AgNO_3

mass of NiCl_2 = 0.00163 g

mole of NiCl_2 present = 0.00163 / 129.5994 = 0.0000126 mole

Molarity = 0.0000126 mole / 0.25 L = 0.0000504 M = 0.05 mM

You might be interested in
Perform the following
Sati [7]

Answer:

35.05152

Explanation:

3 0
3 years ago
The bigger the magnitude , the bigger the Earthquake
aleksley [76]

Answer:

True, in as far as greater magnitude = greater power.

7 0
3 years ago
Read 2 more answers
Define the following terms:
Marrrta [24]

Answer:

a)An endothermic reaction is any chemical reaction that absorbs heat from its environment. The absorbed energy provides the activation energy for the reaction to occur eg Melting of ice, Evaporating liquid water

   b)An Exothermic reaction is a chemical reaction that involves the release of energy in the form of heat or light.eg a spark, flame, or flash), electricity , a battery), or sound , explosion heard when burning hydrogen).

c)By definition an exothermic reaction produces heat as part of it’s process. The heat generated just by being alive is an exothermic process as well. And as such we become aware of when we feel “too cold” or “too hot” and try to either adjust to the conditions we are in, or minimize them, if possible. It is not merely odd, but contrary to intelligent living, that we choose to increase our discomfort and also risk our health by intentionally increasing not only the exothermic reactions we use but also maximize them to our own detriment. In short, the increased use of inefficient exothermic reactions while inexpensive in current evaluations of financial cost are extremely expensive in terms of it’s effect upon living things, including ourselves. It is as though we are choosing our homes to not only be next to a furnace, but as close as possible to the process.

b8

a) it is important to know chemical properties and compounds.] [Chemistry helps our industry produce more materials—such as paints, plastics, iron or steel, cement, kerosene, and also motor oil. Chemistry also helps farmers to enrich the soil with chemicals ... to grow fresh vegetables.]

b)u asked 4 2 l'll give u ten

The 10 Most Important Lab Safety Rules

   The Most Important Lab Safety Rule. ...

   Know the Location of Safety Equipment. ...

   Dress for the Lab. ...

   Don't Eat or Drink in the Laboratory. ...

   Don't Taste or Sniff Chemicals. ...

   Don't Play Mad Scientist in the Laboratory. ...

   Dispose of Lab Waste Properly. ...

   Know What to Do With Lab Accidents.

8 0
3 years ago
What is the formula for hydrogen iodide trihydrate
Natali [406]

HI.3H2O. This is the answer

6 0
3 years ago
What is the hyphen notation of nitrogen
vovikov84 [41]
<span> N-16

</span>7 protons & 9 neutrons
<span>7 + 9 = 16

</span>
6 0
3 years ago
Other questions:
  • What does the term "thermometer" mean?
    7·2 answers
  • Consider the following reaction at equilibrium: 2 NH3(g) ⇄ N2(g) + 3 H2(g) What does Le Chatelier's principle predict will happe
    10·1 answer
  • What are ionic compounds typically composed of?
    14·2 answers
  • What are the ionic bonds
    6·1 answer
  • Consider the unbalanced equation for the oxidation of aluminum.
    8·2 answers
  • Chemical Equations and Reactions WS
    10·1 answer
  • How many Na atomd are shown in the reactants​
    14·1 answer
  • PLS HELP ASAP ON BOTH
    13·2 answers
  • Question 9 (4 points)
    5·2 answers
  • What is the density of a salt solution if 75.0 ml of the solution has a mass of 32.0 g?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!