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
Liula [17]
3 years ago
15

A sample containing KBr (M 119&/mol) and KNO3 (M 101 g/mol) was analysed by using the Mohr method, A 1.1250-g sample is diss

olved into 200.0 ml solution (Solution A). 20.00-ml. of solution A was titrated with 16.25 ml of 0.OSON AgNOs (M 170) solution. a) Report C of ca solution & according to the tination data b) Calculate C% w/w of KBr in the original sample.
Chemistry
1 answer:
djverab [1.8K]3 years ago
8 0

Explanation:

(a)   As we know that relation between normality and volume of two solutions is as follows.

               N_{1}V_{1} = N_{2}V_{2}

As the given data is as follows.

             N_{1} = ?,              N_{2} = 0.050 N

              V_{1} = 20 ml,      V_{2} = 16.25 ml

Therefore, putting the given values into the above formula as follows.

                N_{1}V_{1} = N_{2}V_{2}

                N_{1} \times 20 ml = 0.050 N \times 16.25 ml

                N_{1} = 0.0406 N

Hence, normality of solution A is 0.0406 N.

(b)   As gram equivalent weight of KBr is 119 g/mol.

Formula to calculate normality is as follows.

              Normality = \frac{weight}{gm equi. wt} \times \frac{1000}{V_{ml}}

As volume is 200 ml, normality is 0.0406 N, and gram equi. wt is 119 g/mol. Therefore, putting these values into the above formula as follows.

          Normality = \frac{weight}{gm equi. wt} \times \frac{1000}{V_{ml}}      

          0.0406 N  = \frac{weight}{119 g/mol} \times \frac{1000}{200 ml}

              weight = 0.9668 g

As 0.9668 g of KBr is present in 1.1250 g sample. Hence, weight percentage will be calculated as follows.

                   Weight % of KBr = \frac{0.9668 g}{1.1250 g}

                                               = 85.94%

Thus, we can conclude that C% w/w of KBr in the original sample is 85.94%.

You might be interested in
Which solution contains phenolphthalein pink?
icang [17]
Any liquid with a pH above 8.2.

Phenolphthalein is naturally colorless but turns pink in alkaline solutions. The compound remains colorless throughout the range of acidic pH levels but begins to turn pink at a pH level of 8.2 and continues to a bright magenta at pH 10 and above.
8 0
3 years ago
Read 2 more answers
Please help me get the answer to bothe a and b​
neonofarm [45]

Answer:

If a metal and metal solution react, the more reactive metal will displace the less reactive metal from solution. If the metal in solution you start with is formed from a more reactive metal than the metal to be added, no reaction will occur.

3 0
2 years ago
The equilibrium expression for kp for the reaction below is __________. n2 (g) o2 (g) 2no (g)
PolarNik [594]
For the reaction;
N2(g) + O2(g) = 2NO(g)

Kp = pNO²/ pN₂pO₂; (No units)
where;
pNO is the partial pressure of NO;
pN₂ is the partial pressure of nitrogen
pO₂ is the partial pressure of Oxygen
The equilibrium constant  Kp is deduced from the balanced chemical equation for a reversible reaction, NOT experimental data as is the case for rate expressions in kinetics. 
Kp changes with temperature considerably changing the position of an equilibrium, and, at a constant temperature, and therefore constant K, the position of an equilibrium can change significantly depending on relative concentrations/pressures of 'reactants' and 'products'.
8 0
3 years ago
What is locked up carbon dioxide
katen-ka-za [31]
Basically it means carbon dioxide is removed from the atmosphere and is trapped in e.g. calcium carbonate (like shells), rocks, oceans etc. 
4 0
3 years ago
What can be said about an Endothermic reaction with a negative entropy change?The reaction isa. spontaneous at all temperatures.
Lyrx [107]

Answer:

1. d. The reaction is spontaneous in the reverse direction at all temperatures.

2. c. The reaction is spontaneous at low temperatures.

Explanation:

The spontaneity of a reaction is associated with the Gibbs free energy (ΔG). When ΔG < 0, the reaction is spontaneous. When ΔG > 0, the reaction is non-spontaneous. ΔG is related to the enthalpy (ΔH) and the entropy (ΔS) through the following expression:

ΔG = ΔH - T. ΔS  [1]

where,

T is the absolute temperature (T is always positive)

<em>1. What can be said about an Endothermic reaction with a negative entropy change?</em>

If the reaction is endothermic, ΔH > 0. Let's consider ΔS < 0. According to eq. [1], ΔG is always positive. The reaction is not spontaneous in the forward direction at any temperature. This means that the reaction is spontaneous in the reverse direction at all temperatures.

<em>2. What can be said about an Exothermic reaction with a negative entropy change?</em>

If the reaction is exothermic, ΔH < 0. Let's consider ΔS < 0. According to eq. [1], ΔG will be negative when |ΔH| > |T.ΔS|, that is, at low temperatures.

3 0
3 years ago
Other questions:
  • How many types of atoms can you expect to find in a sample of any element?
    8·1 answer
  • What energy is often called the "graveyard of kinetic energy" and why?
    5·1 answer
  • What is the pH of a solution with a concentration of 3.6 × 10-5 molar H3O+? Show, or explain, the work used to solve this proble
    14·2 answers
  • A liquid's temperature is lowered from 60°C to 10°C. Did the the liquid's vapor pressure increase, decrease, or stay the same du
    10·1 answer
  • Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 ? H3
    7·1 answer
  • A gas has a volume of 300 mL at 300 mm Hg. What will its volume be if the pressure is changed to 500 mm Hg?
    10·1 answer
  • Which is a characteristic of atoms?
    8·2 answers
  • The half life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360 days?
    5·1 answer
  • States of matter are the...
    5·2 answers
  • At 101.3kPa and 298 K. What is the total amount of heat released Open one mole of aluminum oxide is formed from its elements
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!