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What is the approximate pKa of a weak acid HA if a solution of 0.1 M HA and 0.3 M A– has a pH of 6.5?

Using cuffed tracheostomy tubes in infants and children up to _____ years of age makes them more susceptible to tracheal deformation. 

You have a patient that is post tracheotomy of 5 days. The tracheostomy tube becomes dislodged and the patient is unstable. What is the first thing you will do?

The initial tracheostomy tube change should occur between days 7 to ______ post insertion?

What is a typical endotracheal tube size for adult males?

If the OD is too large of a tracheostomy tube, the leak with the cuff deflated will be decreased, affecting the ability to use the upper airway with cuff deflation for speech. 

Which amino acid at physiological pH is shown in the link below? Link

Tracheotomy immediate complications. Select all that are applicable. 

Which of the following best describes the peptide backbone in a beta sheet?

Hydrophobic interactions between nonpolar molecules ______.