1. Commercially available concentrated hydrochloric acid contains… - Vidyadip

Question

Commercially available concentrated hydrochloric acid contains $45\%$ HCl by mass.

What is the molarity of this solution? The density is $1.19g$ mL.
What volume of cone. HCl is required to make $1.00L$ of $0.24M$ HCl?

Write the balanced chemical equations for the following:

$KMnO_4 + NH3 \rightarrow MnO_2 +KOH+ H_2O + N_2$
$HNO_3 + P_4\rightarrow NO_2 + H_3PO_4 + H_2O$

✓

Answer

45% solution, means 45g of HCl in 100g of solution.

Then, Mass of the solution = 100g
Volume of the solution $=\frac{100\text{g}}{\text{Density}}=\frac{100\text{g}}{1.19\text{g/ mL}}$
$=840\text{mL}=\frac{84.0}{1000}\text{L}$
Molar mass of HCl = $36.5g mol^{-1}$
No. of moles of HCl dissolved $=\frac{45}{36.5}\text{mol}=1.23\text{mol}$
$\therefore$ Molarity of HCl solution $=\frac{1.23}{\Big(\frac{84}{1000}\Big)\text{L}}=14.64\text{mol L}^{-1}$

Molarity or conc. HCl sample = 14.64mol/ L

Molarity of HCl solution to be prepared = 0.24mol/ L
Volume of HCl solution to be prepared = 1.00L = 1000mL
Then, using the molarity equation, MV - MV,
$\text{V}_{\text{HCl}}=\frac{0.24}{14.64}=16.40$
Thus, to obtain 1.0L of 0.24M HCl, one should dissolve 16.40mL of conc. HCl to make up the volume to 1.0L.

$2KMnO_4 + 2NH_3 \rightarrow 2MnO_4 + 2KOH + 2H_2O + N_2$
$2OHNO_3 + P_4\rightarrow 2NO_2 + 4H_3PO_4 + 4H_2O$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Some Basic Concepts of Chemistry→Some Basic Concepts of Chemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

1. Give condensed and bond line structural formulas and identify the functional groups present, if any, for:
a. 2, 2, 4-Trimethylpentane
b. 2-Hydroxy-1, 2, 3-propanetricarboxylic acid
c. Hexanedial?
2. Give three points of differences between inductive effect and resonance effect.

One mole of $H_2O$ and one mole of CO are taken in 10L vessel and heated to 725K. At equilibrium 40% of water (by mass) reacts with CO according to the equation,
$\text{H}_2\text{O (g) + CO (g)}\rightleftharpoons\text{H}_2\text{ (g) + CO}_2\text{ (g)}$
Calculate the equilibrium constant for the reaction.

Assign reason for the following:
i. $BaSO _4$ is insoluble although ionic in nature.
ii. $ClF _3$ has only $90^{\circ}$ bond angles.
iii. $SO _2$ is angular but $SO _3$ is planar.
iv. $NH _3$ and $PH _3$ have same hybridization but different bond angle.
v. $CuSO _4 \cdot 5 H _2 O$ loses $4 H _2 O$ on heating but not the fifth molecule.

Discuss the pattern of variation in the oxidation states of,

B to Tl.
C to Pb.

Two flasks 'A' and 'B' have equal volumes. Flask 'A' contains $H_2$ and is maintained at $300K$ while 'B' contains equal mass of $CH_4$ gas and is maintained at $600K$.

Which flask contains greater number of molecules? How many times more?
In which flask pressure is greater? How many times more?
In which flask molecules are moving faster?
In which flask the number of collisions with walls are greater?

Among the second period elements the actual ionization enthalpies are in the order Li < B < Be < C < O < N < F < Ne.Explain why,

Be has higher $\Delta_{\text{t}}\text{H}$ than B
O has lower $\Delta_{\text{t}}\text{H}$ than N and F?

The ionization constant of propanoic acid is $1.32 \times 10^{–5}$. Calculate the degree of ionization of the acid in its $0.05M$ solution and also its pH. What will be its degree of ionization if the solution is $0.01M$ in HCl also?

What does atomic radius and ionic radius really mean to you?

Describe graphically the measurement of change in internal energy $(\Delta U )$ by bomb calorimeter.

Explain why the following compounds behave as Lewis acids?

$BCl_3$.
$AlCl_3$.