Chemistry, 13.12.2020 23:10 rm3582317

Student carries out a titration to determine the concentration of a solution of nitric acid. She titrates the solution of nitric acid against a standard solution
of sodium hydroxide with a known concentration of 0.0998 mol/dm². She
finds that 21.80 cm of the nitric acid solution is needed to exactly neutralise
25.0 cm of the sodium hydroxide solution.
Calculate the concentration of the nitric acid solution. Give your answer to
three significant figures.
The equation for the neutralisation reaction is
HNO3 + NaOH → NaNO3 + H2O

Answers: 3

Show answers

Answers

Answer from: fazegaze89

The concentration of the nitric acid solution is 0.11445 mol/dm³

From the question,

We are to calculate the concentration of the nitric acid solution

The given balanced chemical equation for the reaction is

HNO₃ + NaOH → NaNO₃ + H₂O

This means 1 mole of HNO₃ is needed to completely neutralize 1 mole of NaOH

Using the formula

$\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}$

Where $C_{A}$ is the concentration of acid

$C_{B}$ is the concentration of base

$V_{A}$ is the volume of acid

$V_{B}$ is the volume of base

$n_{A}$ is the mole ratio of acid

$n_{B}$ is the mole ratio of base

From the given information

$C_{B}= 0.0998\ mol/dm^{3}$

$V_{A} = 21.80 \ cm^{3}$

$V_{B} = 25.0 \ cm^{3}$

From the balanced chemical equation

$n_{A} = 1$

$n_{B} =1$

Putting the parameters into the formula, we get

$\frac{C_{A} \times 21.80 }{0.0998 \times 25.0} = \frac{1}{1}$

Then,

$C_{A} \times 21.80=0.0998 \times 25.0$

∴ $C_{A}=\frac{0.0998 \times 25.0}{21.80}$

$C_{A} =\frac{2.495}{21.80}$

$C_{A} = 0.11445 \ mol/dm^{3}$

Hence, the concentration of the nitric acid solution is 0.11445 mol/dm³

Learn more here: link

Answer from: queenfan1818

The concentration of the Nitric acid solution : 0.114 M

Further explanation

Titration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range

Titrations can be acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases

Reaction

HNO₃ + NaOH → NaNO₃ + H₂O

Concentration a standard solution of sodium hydroxide : 0.0998 mol/dm³ , and the volume = 25 cm³

moles NaOH=

$\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles$

From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=2.495 mlmoles

The volume of HNO₃ = 21.8 cm³, so the concentration :

$\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114$

Answer from: Quest

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

Answer from: Quest

the answer is c.the valence of the atoms combine .

Another question on Chemistry

Chemistry, 22.06.2019 00:30

What does x represent in the formula for the compound xcl4?

Answers: 2

Answer

Chemistry, 22.06.2019 17:00

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Answers: 1

Answer

Chemistry, 23.06.2019 00:20

Which diagram represents the phase tha occurs after a solid melts?

Answers: 1

Answer

Chemistry, 23.06.2019 00:30

What are some natural measures of time

Answers: 1

Answer

You know the right answer?

Student carries out a titration to determine the concentration of a solution of nitric acid. She ti...