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Simora [160]
3 years ago
6

Consider the titration of 25.0 mL of 0.340 M HCl with 0.160 M NaOH. What volume of NaOH is required to reach the equivalence poi

nt?
Chemistry
1 answer:
denis23 [38]3 years ago
3 0

Answer:

53.1 mL NaOH

Explanation:

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A beaker contains 20.0 ml of a 50.0 g/L solution. What will the new concentration be if you add 40.0 mL of water?
Ronch [10]

Answer:

moles SO42- = 0.0500 L x 0.20 M=0.010

moles Ba2+ = 0.0500 L x 0.10 M = 0.0050

Ba2+ + SO42- = BaSO4 (s)

moles SO42- in excess = 0.010 - 0.0050=0.0050

total volume = 100 mL = 0.100 L

[SO42-]= 0.0050/0.100= 0.050 M

[Na2SO4] = 2 /2 = 1 M

moles Na2SO4 = 2 M x 0.500 L = 0.500

mass Na2SO4 = 0.500 x 142 g/mol=71.0 g

moles MgBr2 = 46 /184 =0.25

moles Br- = 0.25 x 2 = 0.50

[Br-]= 0.50 / 0.50 L = 1 M

8 0
3 years ago
Which element has the greatest average atomic mass
Vadim26 [7]
Ununoctium, also known as eka-radon. 
hope this helps!
3 0
3 years ago
How many moles is 1.50x10^23 molecules of NH3?
S_A_V [24]

 The   number  of moles that are  1.50  x10^23  molecules of NH3  are  

 =0.249 moles


       <u><em> calculation</em></u>

 The number of  moles is calculated  using  Avogadro's  law  constant

that  is  According  to Avogadro's  law

                         1  moles  of a  substance = 6.02 x10^23  molecules

                                    ?    moles                =  1.50  x10^23  molecules


by  cross  multiplication


= [( 1.50  x 10^23  molecules  x  1 moles) / (6.02 x10^23)]  = 0.249  moles

8 0
3 years ago
Read 2 more answers
Select all of the following statements that are basic assumptions of the Bohr model of the atom. Atoms have a central nucleus wi
Alekssandra [29.7K]

Answer:

The assumptions of the Bohr model of the atom are:

- Atoms have a central nucleus with electrons in orbit about this nucleus.

- They must gain energy to jump to a higher level, and they release energy when jumping to a lower level.

- Electrons orbit the nucleus, but the orbits can have only certain sizes and energy values.

Explanation:

The Bohr model of the atom establishes that atoms have a central nucleus with positive charge and electrons (with a negative charge) in orbit about this nucleus. In the Bohr model, electrons move in specific orbits with a certain amount of energy and can't jump from one orbit to another around the nucleus. To jump to a higher level, they must gain energy or release energy when jumping to a lower level.

The Thomson model of the atom postulated that <em>atoms are solid spheres of matter</em> and <em>are made of positive material with electrons fixed in place in this positive material</em>.

7 0
3 years ago
equilibrium lab analysis questions: use what you learned in this lab to answer the following questions in complete sentences. 1.
Margaret [11]

Answer:

See below  

Explanation:

a) Adding HCl

HBTB is yellow in acid solution.

b) Adding NaOH

HBTB is blue in basic solution.

c) Explanation

HBTB is a weak acid in which the undissociated and ionized forms have different colours.

\underbrace{\hbox{\text{HBTB }}}_{\hbox{\text{yellow}}} + \text{{ H$_{2}$O}}\rightleftharpoons \text{H$_{3}$O$^{+}$} +\underbrace{\hbox{\text{ BTB$^{-}$}}}_{\hbox{\text{blue}}}

Around pH 7 , the indicator consists of roughly equal amounts of the yellow and blue forms, so it appears green

According to Le Châtelier's Principle, if you apply a stress to a system at equilibrium, it will respond in a way that will relieve the stress.

When you added HCl, you increased the concentration of H₃O⁺. The system responded in a way that would decrease the H₃O⁺. That is, the position of equilibrium shifted to the left and produced more of the yellow form.

When you added NaOH, the base removed some of the H₃O⁺. The system responded in a way that would increase the H₃O⁺. That is, the position of equilibrium shifted to the right and produced more of the blue form

7 0
3 years ago
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