Question

Making Solutions Practice Problems: I. How would you prepare 100 ml of a 30% (w/v) solution of polyethylene glycol (PEG)? 2. How would you prepare 50 ml of a 9 % (w /v ) solution of NaCI? 3. How would you prepare 200 ml of 70 % ( v /v ) solution of ethanol from a stock of 95% ethanol? How would you prepare 200 ml of 0.3 M NaCl? (NaCl MW 58.44) 4. 5. How are 50 ml of 20 millimolar (mM) sodium hydroxide (NaOH MW 40) prepared? 6. How would you prepare a 1 1 stock solution of 1M Tris pH 7.5? (FW 121.21)

Answer 1

of glucose Ditute 20 -I 1 ANS =0 +o 4 t1mep with weter 10 mI of 20 -glucase to e.g dituie 1t will be 5-1 salu tion x 2 Ars Voume Kolun! Saluh'4 we knon 1 4-Salutin s D-SR oluek 1.5m 201 0.5-4 solut s of 204 alei is . O.0 375 m 1-Sm regaixd in produco 0s y. te AAS M, U, M2 VL .2 XU00 1 dissdlved 80 mI 150 mil'molay O.oSM 0.05 x 4 M.VI-M2UL 2 - o. mi of Mao1H Teguin +o poedee 5a m 2M 5 A N, VrNLV 50 x 0.2 (om) o mi of JNan Hc di ssalvee to 50 m)

of glucose Ditute 20 -I 1 ANS =0 +o 4 t1mep with weter 10 mI of 20 -glucase to e.g dituie 1t will be 5-1 salu tion x 2 Ars Voume Kolun! Saluh'4 we knon 1 4-Salutin s D-SR oluek 1.5m 201 0.5-4 solut s of 204 alei is . O.0 375 m 1-Sm regaixd in produco 0s y. te AAS M, U, M2 VL .2 XU00 1 dissdlved 80 mI 150 mil'molay O.oSM 0.05 x 4 M.VI-M2UL 2 - o. mi of Mao1H Teguin +o poedee 5a m 2M 5 A N, VrNLV 50 x 0.2 (om) o mi of JNan Hc di ssalvee to 50 m)

1ANS Dissol ve 30 gm of PEG loo mi Volumetic ttosle cnd ditled t 100 cm usi'ng solven to Dy dissoluing 5 gm of Nacl So mi of Soluend of 22 Ans +0 3 Ans bt dissoluing 42 mi J5 ethanal to 200 mi weigi weis motwerg x dm 4Ars molasi mol. w Xdma werght O. 3 M 58.44x O.2 we'ghd 2.3376 gm. of by dissalving 2 337 6 Jm of saverl. in Nac! to 2o0 ml mi volumehic Hagic 200 o- 020 molor 52 20 millimolor UA Maloriy Ma.mass BluM O.02 M 40 xo.0s o ou gm. weig o.ou gm of NauoH ot wer Dissolve Fo 50 6) ut 1 7 mal mass 121.21 121.21 XI By dissaluing 12 1:21 gm ot Tis PH 7.5 t03dm2