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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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Answer:

Human sometimes also anerobically respite this happen usually during vigorous exercise when our heat and lungs are not able to supply enough oxygen to muscle and they carry out anaerobic respiration

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3 years ago
CAN SOMEONE HELP ME WITH THIS
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Answer: it is one parent

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3 years ago
A weather balloon calibrated at 0.00 °C to
Natasha2012 [34]

Answer:

17.3 L

Explanation:

With all other variables held constant, you can find the missing volume using the Charles' Law equation:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. Before we can solve, we need to convert Celsius to Kelvin (because we don't want negative numbers or temp. of 0).

V₁ = 20.0 L                                            V₂ = ? L

T₁ = 0.00 °C + 273.15 = 273.15 K         T₂ = -36.2 °C + 273.15 = 236.95 K

V₁ / T₁ = V₂ / T₂                                             <----- Charles' Law equation

20.0 L / 273.15 K = V₂ / 236.95 K               <----- Insert values

0.0732 = V₂ / 236.95 K                               <----- Simplify left side

17.3 L = V₂                                                   <----- Multiply both sides by 236.95

6 0
2 years ago
____ is the sharing of electrons .
harkovskaia [24]

Answer:

COVALENT BOND

Explanation:

it is a chemical bond that involves the sharing of electrons.

4 0
3 years ago
In the coal-gasification process, carbon monoxide is converted to carbon dioxide via the following reaction: CO (g) H2O (g) CO2
jolli1 [7]

Answer: K_{eq} at  the temperature of the experiment is 0.56.

Explanation:

Moles of  CO = 0.35 mole

Moles of  H_2O = 0.40 mole

Volume of solution = 1.00 L

Initial concentration of CO = \frac{0.35mol}{1.00L}=0.35M

Initial concentration of H_2O = \frac{0.40mol}{1.00L}=0.40M

Equilibrium concentration of CO = \frac{0.19mol}{1.00L}=0.19M

The given balanced equilibrium reaction is,

                      CO(g)+H_2O(g)\rightleftharpoons CO_2(g)+H_2(g)

Initial conc.          0.35 M         0.40 M                  0 M        0M

    At eqm. conc.     (0.35-x) M   (0.40-x) M   (x) M      (x) M

Given:  (0.35-x) = 0.19

x= 0.16 M

The expression for equilibrium constant for this reaction will be,

K_{eq}=\frac{[CO_2]\times [H_2]}{[CO]\times [H_2O]}  

Now put all the given values in this expression, we get :

K_{eq}=\frac{0.16\times 0.16}{(0.35-0.16)\times (0.40-0.16)}

K_{eq}=\frac{0.16\times 0.16}{(0.19)\times (0.24)}=0.56

Thus K_{eq} at  the temperature of the experiment is 0.56.

3 0
3 years ago
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