20210915

Contents

1. 1. Working directories
2. 2. PCMANFM
3. 3. How to Install Android File Transfer for Linux - OMG! Ubuntu!
4. 4. pH meter/Potassium Chloride (KCl)

Working directories

# Backup
Dir=''; \
Drive='ht_5T'; Source="/media/ht/${Drive}/${Dir}/"; Drive='ht_5T_Backup_20210907'; Destination="/media/ht/${Drive}/${Dir}/"; rsync -au --update ${Source} ${Destination}
# 
du /media/ht/ht_5T_Backup_20210907/ -sk; du /media/ht/ht_5T/ -sk; du /media/ht/ht_5T_Backup_20210907/ -sh; du /media/ht/ht_5T/ -sh

PCMANFM

gnome-terminal --geometry=80x16+100+300 %s 

How to Install Android File Transfer for Linux - OMG! Ubuntu!

sudo add-apt-repository ppa:samoilov-lex/aftl-stable
sudo apt-get update && sudo apt install android-file-transfer
# 
###############################################################
# 
axel https://github.com/whoozle/android-file-transfer-linux/releases/download/v4.2/Android_File_Transfer-cce42ee-x86_64.AppImage
# 
flatpak run Android_File_Transfer-cce42ee-x86_64.AppImage

pH meter/Potassium Chloride (KCl)

Concentrated Potassium Chloride (KCl)

• Concentrated Potassium Chloride

• Thereference electrodeof apH meterusually contains ansilver/silverchloride(Ag/AgCl) wire electrode and aconcentrated potassium chlorideelectrolyte.

• This arrangement provides a stable electrical referencepotentialagainst which the electric potential of themeasuring electrodecan be measured against.

• The electrical potential of Ag/AgCl and KCl reference electrode half cell depends on the KCl concentration

  @ 25oC Ag/AgCl - 3.5MKCl ……..0.205 V (Volts)

  @ 25oC Ag/AgCl - supersaturated KCl ……..0.197 V (Volts)

• A supersaturated KCl solution is guaranteed if a persistent presence of KCl crystals is evident.

• The KCl concentration is not critical as long as it remains above a 3molar concentration(3 M).

• A supersaturated solution guarantees that the solution will not fall below the 3molar concentration(3 M) and henceis the recommended concentration for the reference electrode of a pH meter.

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