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3 years ago

Key words how atoms work?

1 answer:

3 0

Most atoms have three different subatomic particles inside them: protons, neutrons, and electrons. The protons and neutrons are packed together into the center of the atom(which is called the nucleus) and the electrons, which are very much smaller, whizz around the outside. Most of an atom is empty space.

I hope this helps you! :D

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If 50. 0 g of formic acid (HCHO2, ka = 1. 8 x 10^-4) and 30. 0 g of sodium formate (NaCHO2) are dissolved to make 500 ml. of sol

Ksju [112]

If 50. 0 g of formic acid (HCHO2, ka = 1. 8 x 10^-4) and 30. 0 g of sodium formate (NaCHO2) are dissolved to make 500 ml. of solution, then the pH of this solution is 3.358.

Option C is correct option.

Given,

Given mass of formic acid = 50 g

Given mass of sodium formate = 30 g

Volume of formic acid = 500 ml

Volume of sodium formate = 500 ml

Molar mass of formic acid = 46 g

Molar mass of sodium formate = 68 g

<h3 /><h3>Calculation of concentration of formic acid and sodium formate</h3>

Molar concentration is defined as the ratio of number of moles and the volume of solution.

Concentration of formic acid

Ca = 50/(46×500)

= 0.00217 m

Concentration of sodium formate

Cb = 30/(68×500)

= 0.00088 m

Using Henderson Hesselbalch equation,

pH = pKa + log(Cb/Ca)

pKa = -log(1.8 × 10^(-4))

= 3.75

Substituting the value of pKa we get,

pH = 3.75 + log(0.00088/0.00217)

pH = 3.75-0.392

pH = 3.35

Thus the value of pH of solution containing formic acid and sodium formate is 3.35.

learn more about pH :

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7 0

2 years ago

PLEASE HELP!! ILL GIVE YOU 30 POINTS!! ANSWER QUICK PLEASE!!!

riadik2000 [5.3K]

1) centrifuge is used to separate mixtures which are heterogeneous in nature.

So here in the given examples

A) Cream and milk, because of their difference in density

2) sterling silver is a homogenous mixture alloy.

So answer is A homogeneous mixture, because the different components are mixed and evenly within the substance

3) Compound is when atoms combine by chemical reaction and they lose their identity

7 0

4 years ago

Read 2 more answers

Calculate the concentration of hydrochloric acid if 50.0 mL of hydrochloric acid is neutralized by 25.0 mL of 2.0 M sodium hydro

Arisa [49]

Answer:

1.0M HCl is the concentration of the acid

Explanation:

Based on the reaction, 1 mole of NaOH reacts per mole of HCl. That means the moles added of NaOH in the neutralization = Moles of HCl in the solution. With the moles and the volume in Liters we can find the molar concentration of HCl

<em>Moles NaOH = Moles HCl:</em>

25.0mL = 0.025L * (2.0moles / L) = 0.050moles HCl

<em>Molarity:</em>

0.050moles HCl / 0.0500L =

<h3>1.0M HCl is the concentration of the acid</h3>

6 0

3 years ago

The chemical symbol of sodium is<br>

ivolga24 [154]

Answer:

Explanation:

6 0

3 years ago

When the ionic compound ammonium chloride, NH 4 Cl, , dissolves in water, it breaks into one ammonium ion, NHt^ 1+ , one chlorid

Arada [10]

Answer:

0.400 moles

Explanation:

Well, you know that one mole of ammonium chloride,

NH 4 Cl , dissociates completely in aqueous solution to form one mole of ammonium cations,

NH + 4 , and one mole of chloride anions, Cl − .

3 0

3 years ago