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gogolik [260]
3 years ago
15

Your lab partner dissolves 0.8392 g unknown bromide (Br-) sample into 210.08 mL of distilled water. 31.50 mL of the unknown brom

ide solution is placed in a 250 mL Erlenmeyer flask with 31 mL of distilled water, 13 mL of well mixed 1% dextrin solution and 4 drops of dichlorofluorescein.
You weighed out 1.7438 g of AgNO3 (purity 96.48 %) through the weighing by difference method. The AgNO3 crystals were placed in a calibrated 300 mL volumetric flask (with a value of 300.10 mL). The AgNO3 solution was used to condition the 50.00 mL burette, and after filling the burette and removing an air bubble, the initial volume was 0.23 mL.

The 1:1 analyte to titrant ratio was reached after 38.25 mL of titrant was added to the Erlenmeyer flask and the precipitate turned a light pink in the solution.

(a) What is the concentration of the AgNO3 solution to the correct number of significant figures?

(b) What is the volume of titrant in L?

(c) What is the volume of the "P" term in L?

(d) What is the mass of the unknown bromide sample in micrograms?

(e) What is the % Br- in this sample to the correct number of significant figures?

Choose the most appropriate answer for each of the five parts.
Chemistry
1 answer:
nikitadnepr [17]3 years ago
4 0

Answer:2

Explanation:

2

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For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion.  Both atoms are joint together by electrostatic interaction and ionic compound sodium chloride is formed.

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For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive and both bonded atoms connected together through covalent bond.

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3 years ago
Read 2 more answers
The second-order rate constant for the dimerization of a protein (P) P + P → P2 is 6.2 × 10−3/M · s at 25°C. Part 1 out of 2 If
siniylev [52]

Answer:

r=1.59\times 10^{-10}\ M/s

Explanation:

According to the law of mass action:-

The rate of the reaction is directly proportional to the active concentration of the reactant which each are raised to the experimentally determined coefficients which are known as orders. The rate is determined by the slowest step in the reaction mechanics.

Order of in the mass action law is the coefficient which is raised to the active concentration of the reactants. It is experimentally determined and can be zero, positive negative or fractional.

The order of the whole reaction is the sum of the order of each reactant which is raised to its power in the rate law.

From the reaction given that:-

P+P\rightarrown P_2

The expression for the rate is:-

r=k[P]^2

Given that;- k= 6.2\times 10^{-3} /Ms

[P] = 1.6\times 10^{-4} M

Thus,

r=6.2\times \:10^{-3}\times \:\left(1.6\times \:\:10^{-4}\right)^2\ M/s=1.59\times 10^{-10}\ M/s

8 0
3 years ago
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