Question: will dna precipitate in 70 ethanol?
Answer: 70% EtOH is used to wash DNA pellets (after precipitation/centrifugation) because the 30% of water will solubilize the excess of salts used for precipitation while maintaining the DNA insoluble (for precipitating DNA you add 2 - 2.2 volumes of absolute ethanol to your volume of DNA so that the final concentration of ...