The list of deleterious materials has always remained fluid because as technology advances new products come onto the market and medical research establishes new risks to health. Clauses in contracts and appointment documents often refer to compliance with 'Good Practice in the selection of construction materials'.he list of deleterious materials has always remained fluid because as technology advances new products come onto the market and medical research establishes new risks to health. Clauses in contracts and appointment documents often refer to compliance with 'Good Practice in the selection of construction materials'.
Hydrogen peroxide is a weak acid. Generally, acids distinguishable by the hydrogen proton, while bases are generally anything with a hydroxide. For instance, hydrochloric acid, or HCl, can be distinguished by the H+ bonded with Cl-. NaOH on the other hand, is a bond between Na+ and OH-.
  HCO3- is both an acid and a base. It can donate a proton (hydrogen ion) as follows: HCO3(-) = H(+) + CO3(-2) or HCO3(-) + OH(-) = H2O + CO3(-2) It can also abs â¦ orb a proton: HCO3(-) + H(+) = H2CO3 Which occurs depends on the pH of the solution.The pKa values are given here: http://wiki.answers ...he conjugated acid of HCO3- is: H2CO3, carbonic acid. Conjugated pairs of acid and base always differ ONE (1) proton (H+): The acid WITH and the base WITHOUT it.