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andre [41]
2 years ago
13

The pigment which determines skin color is .

Chemistry
2 answers:
kolbaska11 [484]2 years ago
6 0
The pigment which determines skin color is Melanin
Vladimir79 [104]2 years ago
3 0
Melanin , as far as I know 
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Answer:

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3 years ago
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When two substances react to form products, the reactant which is used up is called the ____.
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The reactant being used up is called limiting reagent as it limits the total amount of product produced.

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When neutralizing your acid extracts, you determined how much base solution was needed to fully neutralize your acid and reach a
alukav5142 [94]

Answer:

The amount of base needed is the amount that would give one mole of the hydroxide ion needed to neutralise one mole of the hydroxonium ion from the acid.

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In a completely neutralized reaction, the resulting salt is formed when there is complete dissociation of the acid and base to give salt and water with a pH of 7.

In the given question, the stated pH of between 8-9 tells us that the salt produced in this particular neutralization reaction is basic or alkaline. This usually occurs when a strong base reacts with a weak acid, producing a higher concentration of the hydroxide ion at equilibrium.

Hence the amount of base needed is the amount that would give one mole of the hydroxide ion needed to neutralise one mole of the hydroxonium ion from the acid.

If the concentration or molarity of the acid is known, then the exact amount of base required to neutralize it can be calculated. This is usually done via titrating the acid against drop wise solution of the base. Neutralization usually occurs when there is a change in colour of the resulting solution. The pH of the resulting solution can be determined using a litmus paper.

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