1. will come
2. didn't go...............................
What was his|her name
am I going to marry Tom
where had he been
if Ali already left
I will be able to pay back
who was the best...
how much do you need
about how far is the sun from the Earth
how to cook couscous
whether he has to finish...
She goes to her grandma's house early in the morning and leaves late in the afternoon . They always have a great time together ! Today , Flora is helping her grandma make a cake . They are making a big cake because its Flora's birthday.
The bath has no zerkalo.V bathroom mirror. There bath mirror
Buffer solutions, depending on their composition, are divided into 2 main types:
acidic and basic.
Acid buffering systems are usually formed by a weak inorganic or
organic acid and a salt of the same acid with a strong base.
For example:
1) CH3COOH + CH3COONa - acetate buffer
weak acid salt acid
2) H2CO3 (H2O + CO2) + NaHCO3 - hydrocarbonate or
weak acid salt acid bicarbonate buffer.
Basic buffer systems are formed by weak inorganic or
organic base and a salt of this base with a strong acid. For example:
1) NH3 · H2O (NH4OH) + NH4Cl - ammonia buffer
weak base salt
2) C2H5 – NH2 + C2H5NH3Cl - ethylamine buffer
weak base salt
Basic buffer systems are formed by weak inorganic or
organic base and a salt of this base with a strong acid. For example:
1) NH3 · H2O (NH4OH) + NH4Cl - ammonia buffer
weak base salt
2) C2H5 – NH2 + C2H5NH3Cl - ethylamine buffer
weak base salt.