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goblinko [34]
4 years ago
6

A student makes a mistake while preparing a vitamin C sample for titration and adds the potassium iodide solution twice. How wil

l the larger quantity of KI influence the amount of NBS needed to titrate the sample? a. Increase it. b. Decrease it. c. Will have no effect on it.
Chemistry
1 answer:
LiRa [457]4 years ago
5 0

The added KI does not have any impact  

The reaction invovles Titration of vitaminc ( Ascorbic acid)

ascorbic acid + I₂ → 2 I⁻  +  dehydroascorbic acid

the excess iodine is free reacts with the starch  indicator, forming the blue-black starch-iodine complex.  

This is the endpoint of the titration. since alreay excess KI is added ( the source of Iodine), it does not have an influence.

Answer B

Hope this helps!

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Addition reactions of alkenes are characterized by _________. A) formation of a bond B) addition of two groups across a double b
mr_godi [17]

Answer:

B. ADDITION OF TWO GROUPS ACROSS A DOUBLE BOND

Explanation:

Addition reaction of alkenes involves the conversion of the double bond in alkenes Inyo single bonds by the addition of two groups of atoms or radicals.

During this addition reaction, two substances, an unsaturated compound(e.g. ethane) and an attacking reagent (hydrogen, halogens, hydrogen halides, chlorine and bromine water) combines to form a single new compound without forming any other products. So a saturated product or one in which is an increase in degree of saturation is formed.

7 0
3 years ago
Which (3 of the 4) quantities must be conserved in all chemical reactions?
Helen [10]

Mass, charge, and energy are conserved, no matter how much volume of
space they may be spread through either before or after the reaction.

Concerning density ...
Think about the fascinating classroom demonstration where the teacher
drops a tiny pellet of sodium into a glass of water.  The sodium gets very
excited, and it skates and skitters around on the surface of the water,
faster and faster, and eventually it explodes.  All the girls in the class
scream, while the guys are just sitting there and staring at the cloud
of steam that's rising from the glass of water.  The whole point here
is that the density of the steam is much different from the density of
either the water or the sodium that reacted to create it.  The density
is not conserved.


7 0
3 years ago
The key term which means moon blocks sunlight to the earth is
Lelu [443]

Answer:

Solar eclipses

Explanation:

4 0
3 years ago
hich of the following statements is not true for an exothermic reaction? Question 2 options: The products have a higher heat con
yKpoI14uk [10]

Answer:

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.

3 0
3 years ago
Calculate the density of an object with a mass of 6.147 and a volume of 9.3 (include units)
Olin [163]
Here is the formula for density:
Density (D) = Mass (M) divided by Volume (V)

So you would do D = 6.147 divided by 9.3

As an as answer you would get: 0.6609677419g/cm^3

Additional information:

The formula for volume is:
V = M divided by D


The formula for Mass is:
M = D times V


I hope this helps :)
5 0
4 years ago
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