The mass fraction of iodine in the pharmacy iodine tincture is 5%. What mass of iodine and alcohol should be taken to prepare 200 g of tincture?
w (I₂) = 5%
m (p-pa) = 200g
m (I₂), m (alcohol)
m (I₂) = w (I₂) * m (p-pa) = 0.05 * 200 = 10g
m (alcohol) = m (p-pa) – m (I₂) = 200-10 = 190g
Answer: m (I₂) = 10g, m (H₂O) = 190g
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.