Skip to main content
Indietro

General Biology: Moles, Molarity, and pH Basics

I pulsanti di controllo sono stati cambiati in modalità "navigazione".
1/20

Termini in questo insieme (20)

  • What is a mole in chemistry?

    A mole is a practical unit for defining a collection of atoms, equal to \(6.022 \times 10^{23}\) atoms.

  • What is Avogadro's number?

    Avogadro's number is \(6.022 \times 10^{23}\) and is the basis for the concept of the mole.

  • What conversions does Avogadro's number allow?

    It converts between moles and the number of atoms, molecules, or formula units.

  • What does molar mass convert between?

    Molar mass converts between grams and moles of a substance.

  • How do you calculate mass from moles?

    Mass (g) = moles × molar mass (g/mol).

  • What is the formula for molarity?

    Molarity (M) = moles of solute / liters of solution.

  • What are the units of molarity?

    Molarity units are moles per liter (mol/L).

  • How do you convert milliliters to liters for molarity calculations?

    Convert volume in milliliters to liters by dividing by 1000 before using in molarity formulas.

  • How do you calculate grams of solute needed for a given molarity and volume?

    Grams = molarity × volume (L) × molar mass (g/mol).

  • What is the pH scale?

    The pH scale indicates acidity or basicity, ranging from 0 (very acidic) to 14 (very basic).

  • How is pH defined mathematically?

    pH = -log[\(H_3O^+\)], the negative logarithm of hydronium ion concentration.

  • What is the relationship between pH and pOH?

    The exponents of \(H^+\) and \(OH^-\) ions sum to 14, so pH + pOH = 14.

  • What conversion factors are important for calculating atoms, moles, and mass?

    Density (g/mL), atomic mass unit to grams, Avogadro's number, and molar mass conversions.

  • How do you convert grams to moles?

    Moles = grams / molar mass (g/mol).

  • How do you convert moles to number of particles?

    Particles = moles × Avogadro's number.

  • How do you convert number of particles to moles?

    Moles = particles / Avogadro's number.

  • Why is it important to check your molarity calculations?

    To ensure the calculated grams and volume produce the desired molarity by converting back and verifying.

  • What is the significance of molarity in acid-base chemistry?

    Molarity measures the concentration of hydronium or hydroxide ions, important for pH and pOH calculations.

  • What should you do if given volume in mL for molarity problems?

    Always convert mL to liters before using the molarity formula.

  • What is the practical use of molarity in biology?

    Molarity helps prepare solutions with precise concentrations for experiments and reactions.