def formolIndex (NaOH_volume, NaOH_molarity, NaOH_fc, grams_of_honey):
    """
    Function to calculate the formol index in honey
    """
    number_of_NaOH_mols = NaOH_volume * NaOH_molarity * NaOH_fc
    volume = number_of_NaOH_mols / NaOH_molarity
    formol_index = (volume * 1000) / grams_of_honey
    return formol_index