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.
1181 Psidium guajava-Guava Ruby Supreme, 3 gal. Tropical Guava Ruby Supreme. Considered by many to be one of the best guavas for the home garden. This highly productive cultivar produces pear-shaped, yellow skinned guavas with thick, pink flesh.Lower in pectin than other varieties, this variety is superior for eating out-of-hand or processing into juice.181 Psidium guajava-Guava Ruby Supreme, 3 gal. Tropical Guava Ruby Supreme. Considered by many to be one of the best guavas for the home garden. This highly productive cultivar produces pear-shaped, yellow skinned guavas with thick, pink flesh.