15 Facts on HF + NaHSO3 : What, How To Balance & FAQs

A chemical reaction can be either reversible or irreversible reaction. Let us discuss about the reaction of HF and NaHSO₃ and it’s various facts.

Hydrogen fluoride is an electronegative compound which gets dissolved in water to give strong hydro fluoric acid . Sodium bisulphate or NaHSO₃ is also called sodium hydrogen sulphate is a white or yellow crystalline solid substance. The dipole moment of HF is 1.86 D having 91.7 pm bond length.

NaHSO₃ is used as food additives,reducing agents and as decomposer in textile industry. Let us discuss about HF + NaHSO₃ with all its details.

What is the product of HF and NaHSO₃

HF reacts with NaHSO₃ to form sodium fluoride,NaF and Sulphurus acid, H₂SO₃.

HF + NaHSO₃ ——> NaF + H₂SO₃

What type of reaction is HF + NaHSO₃

HF + NaHSO₃ is a double displacement reaction. In this reaction both the reactants HF and NaHSO₃ exchange or displaces their respective cations to form the products sodium fluoride and Sulphurus acid.

How to balance HF + NaHSO₃

The physical states of reactants and products are usually indicated in brackets as subscript . The unbalanced equation of HF + NaHSO₃

HF + NaHSO₃ ——–> NaF + H₂SO₃

• Assigning certain coefficients to both reactants and products

• a HF + b NaHSO₃ ——> c NaF + d H₂SO₃

• An equation is made with the above equation

• H= a= b = 2d, F=a =c, S =b = d, O=3b = 3d, Na = b= c

• The equation made is a+ b = 2d, a= c, b= d, 3b = 3d, b= c

• Solve the above equation using gauss elimination method. The values of coefficients is a =1, b= 1, c= 1, d= 1

• The balanced equation of HF + NaHSO₃ is

• HF + NaHSO₃ ——-> NaF + H₂SO₃

HF + NaHSO₃ titration

HF + NaHSO₃ titration can be performed using suitable indicator.

Apparatus

Conical flask, burette, indicator, pipette.

Indicator

Methyl orange

Procedure

• A standard solution of sodium hydrogen sulphate is prepared by dissolving NaHSO₃ in water.
• A definite amount of solution is pipetted into a conical flask and add methyl orange indicator.
• The solution in conical flask is then titrated against HF taken in burette.
• The titration is continued until the color change is observed.
• Note down the values and respective calculations done to determine its molarity, molality etc.

HF + NaHSO₃ net ionic equation

The net ionic equation of HF and NaHSO₃

HF + H⁺ +SO₃^2-——-> F^– + H₂SO₃

Both HF and H₂SO₃ does not dissociate while NaF and NaHSO₃ undergoes dissociation.

HF + NaHSO₃ conjugate Pairs

HF + NaHSO₃ has conjugate pairs.

• The conjugate base of HF is F^– or fluoride.
• The Conjugate acid of HF is fluoronium.
• The Conjugate acid of NaHSO₃ is H₂SO₃.

HF and NaHSO₃ intermolecular forces

The intermolecular forces exist in between HF + NaHSO₃ is

• Dipole dipole interaction , hydrogen bonding and London dispersion forces are observed in HF.

• In NaHSO3 also covalent bond is observed between sulphur and oxygen, hydrogen bond and coordinate bonds are also seen.

HF + NaHSO₃ reaction enthalpy

The reaction enthalpy of HF + NaHSO₃ is 192.94 KJ/mol.

• The enthalpy of formation of HF, NaHSO₃, NaF and H₂SO₃ is -14.99, -1387.1, -573.6 and -635.55 kJ/mol respectively.
• Hence enthalpy is {-14.99 + -635.55-(-14.99 + -1387.1)}.

Is HF + NaHSO₃ a buffer solution

HF + NaHSO₃ is not a buffer solution. Here HF is a weak acid and NaHSO₃ is an acidic salt. Mixing both these will not make a buffer solution.

Is HF + NaHSO₃ a complete reaction

HF + NaHSO₃ is a complete reaction. The reaction takes place to form sodium fluoride,NaF and Sulphurus acid,H₂SO₃. Both are stable products. NaF is a water soluble substance which is basic in nature.

Is HF + NaHSO₃ an exothermic or endothermic reaction

HF + NaHSO₃ is an endothermic reaction. In this reaction heat energy is absorbed not liberated. So it is an endothermic reaction with positive value of enthalpy.

Is HF + NaHSO₃ a redox reaction

HF + NaHSO₃ is not a redox reaction. Because the oxidation number of reactants and products retain as it is before and after the reaction. So it’s not a redox reaction.

Is HF + NaHSO₃ a precipitation reaction

HF + NaHSO₃ is reaction doesn’t form any precipitate. It is because the product formed sodium fluoride is a water soluble substance.

Is HF + NaHSO₃ reversible or irreversible reaction

HF + NaHSO₃ is an irreversible reaction. The reaction can’t be reversed to yield back its reactants

Is HF + NaHSO₃ a displacement reaction

HF + NaHSO₃ is a double displacement reaction where both the reactants displaces the cations to yield the products.

Conclusion

The strong attraction between hydrogen and Fluorine in HF is due to hydrogen bonding. NaHSO₃ is a solid substance having 104.061 g/mol molar mass with 1.48 g/cm³ density. The melting point and boiling point of NaHSO₃ is 150⁰ C and 315⁰ C respectively.