O‘qituvchi sizga qaysi tuzdan eritma tayyorlash va uning massa ulushi nechaga teng bo‘lishi haqida topshiriq bergandan so‘ng, ishni quyidagi tartibda bajaring:
Tuzning massasini hisoblang va uni tarozida tortib oling.
Suv massasini uning hajmiga teng deb hisoblab, kerakli mikdor suvni o‘lchov silindrda o‘lchab oling va uni tuz solingan stakanga quying.
Stakandagi tuz to‘liq erib ketguncha eritmani aralashtirgich bilan aralashtiring.