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Veseljchak [2.6K]
3 years ago
14

Phenolphthalein indicator is??

Chemistry
1 answer:
Aleonysh [2.5K]3 years ago
7 0

Answer:

Hey mate.....

Explanation:

This is ur answer.....

<em>Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.</em>

Hope it helps!

mark me brainliest pls....

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Which of the following increases as you move up a column of the periodic table?
luda_lava [24]

Answer:

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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766
Marina CMI [18]

The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

average atomic mass = \Sigma {percent abundance}\times {atomic mass}

Substituting the values in the formula:

average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}

average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}

average atomic mass = \frac{20721.688371}{100} = 207.22 amu

The most common isotope of lead is:

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The atomic symbol of lead is Pb. The atomic number of Pb is 82.

So, the the most common isotope of lead can be written as:

_{207.22}^{82}Pb and Lead - 207.22 amu.

3 0
3 years ago
62 grams of Zn(C2H3O2)4 are dissolved to make a 1.5 M solution. How many milliliters of water are needed?
LenKa [72]
Molarmass of <span>Zn(C2H3O2)4 is 301.5561 g/mol

moles of </span>
<span>Zn(C2H3O2)4
= 62 g * 1 mol/(</span><span>301.5561 g) = 0.2056 mol

concentration = moles / volume
concentration * volume = moles
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volume = 0.2056 mol / 1.5 M
volume = 0.13706 L
volume = 137 mL
volume = 140 mL
</span>


3 0
4 years ago
Read 2 more answers
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dybincka [34]

Answer:

I'm not all the way sure but I think it is C

Explanation:

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3 0
2 years ago
A chemist needs 2.00 liters of hydrochloric acid. How many pints is this?
77julia77 [94]
Is that supposed to say 200/2.00??
6 0
4 years ago
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