Answer:
It represents the <em>number of atoms</em> of that particular element present in the compound. In C₂H₄O₂ there are 2 Carbon atoms, 4 Hydrogen atoms and 2 Oxygen atoms.
Salt can dissolve in water because it is an ionic compound. The Na⁺ and Cl⁻ ions get solvated by the water molecules and leave the surface of the crystal;
The formula of ethanol is CH₃CH₂OH. Ethanol can dissolve in water because its OH group can form strong hydrogen bonds to the water molecules.
Answer:
The pH of a water at 25°C that contains 0.6580 mg/L carbonic acid is 5.7.
Explanation:
First, the molar mass of carbonic acid is 62g/mol, thus
The solution has a concentration of 1.06x10-5 mol/L.
Second, the acid-base balance is araised, with the initial and the equilibrium concentrations
H2CO3 + H2O ⇄ HCO3− + H3O+
i) 1.06x10-5 - -
eq) 1.06x10-5 - <em>x</em> <em>x</em> <em>x</em>
Knowing the Ka of carbonic acid (4.3x10-7) the expression of the equilibrium constant is written
Clearing the <em>x</em>, and solving the quadratic equation
Only the positive value is correct, so [H+ ]=[HCO3 − ] = 1.9x10-6
Since, pH = - Log [H+ ]
Answer:
When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound. In all of these reactions, the metal atoms give electrons to the non-metal atoms.