At the other extreme, a 10 M solution of NaOH would have a pH of 15. Numerical examples from Shipman, Wilson and Todd. In pure water, the molar concentration of H + ions is 10-7 M and the concentration of OH-ions is also 10-7 M.
In order to tell if a guava is ripe, squeeze it gently. If it gives under your fingers, its ripe. 2. Look for any blemishes on the guava. You want to try to select guavas that are blemish-free. Blemishes or bruises can mean the fruit is bad or will not taste good. 3. Check the color of the guava. Ripe guavas are those that have gone from bright green to a softer yellowish-green color. If you see a touch of pink on the fruit, it is in its prime. If you don't find any that are yellow, you can always buy green guava and wait for them to ripen.
Dark red skinned guava, closely related to the common guava, with an excellent strawberry like flavor. Fruits are small, to 1.5 around, and the pulp is translucent and very juicy. It some varieties, the flesh can taste pleasantly spicy.ots of water is needed during fruit development and for proper ripening to occur. The yellow strawberry guava (Psidium cattlenium var. lucidum) is said to be not quite as hardy as the standard red strawberry guava, but seems to survive temperatures to 25F.