In chemistry, the pH of an aqueous solution is a measure of its acidity. A solution with a pH of 7 is said to be neutral, a solution with a pH greater than 7 is basic, and a solution with a pH less than 7 is acidic

Ch8Ex19.m

% Create a vector of structures to store solution

% names and their pH values

phvals(2) = struct('solname', 'water', 'ph', 7);

phvals(1) = struct('solname', 'coffee', 'ph', 5);

new = addAcidity(phvals)

addAcidity.m

function outph = addAcidity(phvals)

% Determines acidity for solutions and adds

% a field to the phvals structures

% Format of call: addAcidity(vec of solutions structs)

% Returns new vector of structs with acidity field

outph = phvals;

for i = 1:length(phvals)

 if phvals(i).ph == 7

 outph(i).acidity = 'neutral';

 elseif phvals(i).ph < 7

 outph(i).acidity = 'acidic';

 else

 outph(i).acidity = 'basic';

 end

end

end